Add a map renderer (#3613)

Co-authored-by: github-actions <github-actions@users.noreply.github.com>

Content.MapRenderer/Extensions/DirectoryExtensions.cs

@@ -0,0 +1,32 @@
+using System.IO;
+using System.Reflection;
+
+namespace Content.MapRenderer.Extensions
+{
+    public static class DirectoryExtensions
+    {
+        public static DirectoryInfo RepositoryRoot()
+        {
+            // space-station-14/bin/Content.MapRenderer/Content.MapRenderer.dll
+            var currentLocation = Assembly.GetExecutingAssembly().Location;
+
+            // space-station-14
+            return Directory.GetParent(currentLocation)!.Parent!.Parent!;
+        }
+
+        public static DirectoryInfo Resources()
+        {
+            return new DirectoryInfo($"{RepositoryRoot()}{Path.DirectorySeparatorChar}Resources");
+        }
+
+        public static DirectoryInfo Maps()
+        {
+            return new DirectoryInfo($"{Resources()}{Path.DirectorySeparatorChar}Maps");
+        }
+
+        public static DirectoryInfo MapImages()
+        {
+            return new DirectoryInfo($"{Resources()}{Path.DirectorySeparatorChar}MapImages");
+        }
+    }
+}

Content.MapRenderer/Extensions/EnvironmentExtensions.cs

@@ -0,0 +1,20 @@
+#nullable enable
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Content.MapRenderer.Extensions
+{
+    public static class EnvironmentExtensions
+    {
+        public static bool TryGetVariable(string key, [NotNullWhen(true)] out string? value)
+        {
+            return (value = Environment.GetEnvironmentVariable(key)) != null;
+        }
+
+        public static string GetVariableOrThrow(string key)
+        {
+            return Environment.GetEnvironmentVariable(key) ??
+                   throw new ArgumentException($"No environment variable found with key {key}");
+        }
+    }
+}