Map renderer decal painter (#6754)

* Map renderer decal painter

* not yet

* no conk dick

Content.MapRenderer/Painters/DecalData.cs

@@ -0,0 +1,18 @@
+using Content.Shared.Decals;
+
+namespace Content.MapRenderer.Painters;
+
+public sealed class DecalData
+{
+    public DecalData(Decal decal, float x, float y)
+    {
+        Decal = decal;
+        X = x;
+        Y = y;
+    }
+
+    public Decal Decal;
+
+    public float X;
+    public float Y;
+}