Stylesheets: Take advantage of Font stacking (#5111)

Depends on https://github.com/space-wizards/RobustToolbox/pull/2182
 - Adds Noto Sans Symbols and its sequel, Noto Sans Symbols 2: Revenge
   of the Unicode.
 - Uses a stack of Noto Sans, Symbols, and Symbols 2 in all places where
   Noto Sans/Noto Sans Display are used.

If you _really_ wanted to, you could use this to add Noto Emoji too.

In considering this, please remember that not everything that _can_ be
done, _should_ be done.

Content.Client/Resources/ResourceCacheExtensions.cs

@@ -27,5 +27,23 @@ namespace Content.Client.Resources
         {
             return cache.GetFont(new ResourcePath(path), size);
         }
+
+        public static Font GetFont(this IResourceCache cache, ResourcePath[] path, int size)
+        {
+            var fs = new Font[path.Length];
+            for (var i = 0; i < path.Length; i++)
+                fs[i] = new VectorFont(cache.GetResource<FontResource>(path[i]), size);
+
+            return new StackedFont(fs);
+        }
+
+        public static Font GetFont(this IResourceCache cache, string[] path, int size)
+        {
+            var rp = new ResourcePath[path.Length];
+            for (var i = 0; i < path.Length; i++)
+                rp[i] = new ResourcePath(path[i]);
+
+            return cache.GetFont(rp, size);
+        }
     }
 }

Content.Client/Stylesheets/StyleBase.cs

@@ -41,8 +41,26 @@ namespace Content.Client.Stylesheets
 
         protected StyleBase(IResourceCache resCache)
         {
-            var notoSans12 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 12);
-            var notoSans12Italic = resCache.GetFont("/Fonts/NotoSans/NotoSans-Italic.ttf", 12);
+            var notoSans12 = resCache.GetFont
+            (
+                new []
+                {
+                    "/Fonts/NotoSans/NotoSans-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols2-Regular.ttf"
+                },
+                12
+            );
+            var notoSans12Italic = resCache.GetFont
+            (
+                new []
+                {
+                    "/Fonts/NotoSans/NotoSans-Italic.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols2-Regular.ttf"
+                },
+                12
+            );
             var textureCloseButton = resCache.GetTexture("/Textures/Interface/Nano/cross.svg.png");
 
             // Button styles.

Content.Client/Stylesheets/StyleNano.cs

@@ -18,6 +18,27 @@ using static Robust.Client.UserInterface.StylesheetHelpers;
 
 namespace Content.Client.Stylesheets
 {
+    public static class ResCacheExtension
+    {
+        public static Font notoStack(this IResourceCache resCache, string variation = "Regular", int size = 10, bool display = false)
+        {
+            var ds = display ? "Display" : "";
+            var sv = variation.StartsWith("Bold") ? "Bold" : "Regular";
+            return resCache.GetFont
+            (
+                // Ew, but ok
+                new []
+                {
+                    $"/Fonts/NotoSans{ds}/NotoSans{ds}-{variation}.ttf",
+                    $"/Fonts/NotoSans/NotoSansSymbols-{sv}.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols2-Regular.ttf"
+                },
+                size
+            );
+
+        }
+
+    }
     public sealed class StyleNano : StyleBase
     {
         public const string StyleClassBorderedWindowPanel = "BorderedWindowPanel";
@@ -88,19 +109,19 @@ namespace Content.Client.Stylesheets
 
         public StyleNano(IResourceCache resCache) : base(resCache)
         {
-            var notoSans10 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 10);
-            var notoSansItalic10 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Italic.ttf", 10);
-            var notoSans12 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 12);
-            var notoSansItalic12 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Italic.ttf", 12);
-            var notoSansBold12 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Bold.ttf", 12);
-            var notoSansBoldItalic12 = resCache.GetFont("/Fonts/NotoSans/NotoSans-BoldItalic.ttf", 12);
-            var notoSansDisplayBold14 = resCache.GetFont("/Fonts/NotoSansDisplay/NotoSansDisplay-Bold.ttf", 14);
-            var notoSansDisplayBold16 = resCache.GetFont("/Fonts/NotoSansDisplay/NotoSansDisplay-Bold.ttf", 16);
-            var notoSans15 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 15);
-            var notoSans16 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 16);
-            var notoSansBold16 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Bold.ttf", 16);
-            var notoSansBold18 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Bold.ttf", 18);
-            var notoSansBold20 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Bold.ttf", 20);
+            var notoSans10 = resCache.notoStack(size: 10);
+            var notoSansItalic10 = resCache.notoStack(variation: "Italic", size: 10);
+            var notoSans12 = resCache.notoStack(size: 12);
+            var notoSansItalic12 = resCache.notoStack(variation: "Italic", size: 12);
+            var notoSansBold12 = resCache.notoStack(variation: "Bold", size: 12);
+            var notoSansBoldItalic12 = resCache.notoStack(variation: "BoldItalic", size: 12);
+            var notoSansDisplayBold14 = resCache.notoStack(variation: "Bold", display: true, size: 14); 
+            var notoSansDisplayBold16 = resCache.notoStack(variation: "Bold", display: true, size: 16);
+            var notoSans15 = resCache.notoStack(variation: "Regular", size: 15);
+            var notoSans16 = resCache.notoStack(variation: "Regular", size: 16);
+            var notoSansBold16 = resCache.notoStack(variation: "Bold", size: 16);
+            var notoSansBold18 = resCache.notoStack(variation: "Bold", size: 18);
+            var notoSansBold20 = resCache.notoStack(variation: "Bold", size: 20);
             var windowHeaderTex = resCache.GetTexture("/Textures/Interface/Nano/window_header.png");
             var windowHeader = new StyleBoxTexture
             {

Content.Client/Stylesheets/StyleSpace.cs

@@ -27,8 +27,26 @@ namespace Content.Client.Stylesheets
 
         public StyleSpace(IResourceCache resCache) : base(resCache)
         {
-            var notoSans10 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 10);
-            var notoSansBold16 = resCache.GetFont("/Fonts/NotoSans/NotoSans-Bold.ttf", 16);
+            var notoSans10 = resCache.GetFont
+            (
+                new []
+                {
+                    "/Fonts/NotoSans/NotoSans-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols2-Regular.ttf"
+                },
+                10
+            );
+            var notoSansBold16 = resCache.GetFont
+            (
+                new []
+                {
+                    "/Fonts/NotoSans/NotoSans-Bold.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols-Regular.ttf",
+                    "/Fonts/NotoSans/NotoSansSymbols2-Regular.ttf"
+                },
+                16
+            );
 
             var progressBarBackground = new StyleBoxFlat
             {