Use read-only autoimplemented property when possible

OpenRA.Game/Graphics/HardwarePalette.cs

@@ -17,8 +17,8 @@ namespace OpenRA.Graphics
 {
 	public sealed class HardwarePalette : IDisposable
 	{
-		public ITexture Texture { get; private set; }
-		public ITexture ColorShifts { get; private set; }
+		public ITexture Texture { get; }
+		public ITexture ColorShifts { get; }
 
 		public int Height { get; private set; }
 		readonly Dictionary<string, ImmutablePalette> palettes = new Dictionary<string, ImmutablePalette>();

OpenRA.Game/Graphics/SpriteFont.cs

@@ -17,7 +17,7 @@ namespace OpenRA.Graphics
 {
 	public sealed class SpriteFont : IDisposable
 	{
-		public int TopOffset { get; private set; }
+		public int TopOffset { get; }
 		readonly int size;
 		readonly SheetBuilder builder;
 		readonly IFont font;

OpenRA.Game/Graphics/WorldRenderer.cs

@@ -26,7 +26,7 @@ namespace OpenRA.Graphics
 		public readonly Size TileSize;
 		public readonly int TileScale;
 		public readonly World World;
-		public Viewport Viewport { get; private set; }
+		public Viewport Viewport { get; }
 		public readonly ITerrainLighting TerrainLighting;
 
 		public event Action PaletteInvalidated = null;