Add some missing Dispose calls, fix some Dispose implementations.

OpenRA.Game/FileSystem/InstallShieldCABExtractor.cs

@@ -17,7 +17,7 @@ using ICSharpCode.SharpZipLib.Zip.Compression;
 
 namespace OpenRA.FileSystem
 {
-	public class InstallShieldCABExtractor : IFolder
+	public sealed class InstallShieldCABExtractor : IFolder
 	{
 		const uint FileSplit = 0x1;
 		const uint FileObfuscated = 0x2;

OpenRA.Game/GlobalChat.cs

@@ -66,7 +66,7 @@ namespace OpenRA.Chat
 		}
 	}
 
-	public class GlobalChat : IDisposable
+	public sealed class GlobalChat : IDisposable
 	{
 		readonly IrcClient client = new IrcClient();
 		volatile Channel channel;

OpenRA.Game/Graphics/HardwareCursor.cs

@@ -17,7 +17,7 @@ using OpenRA.Primitives;
 
 namespace OpenRA.Graphics
 {
-	public class HardwareCursor : ICursor
+	public sealed class HardwareCursor : ICursor
 	{
 		readonly Dictionary<string, IHardwareCursor[]> hardwareCursors = new Dictionary<string, IHardwareCursor[]>();
 		readonly CursorProvider cursorProvider;

OpenRA.Game/Graphics/SoftwareCursor.cs

@@ -24,7 +24,7 @@ namespace OpenRA.Graphics
 		void Tick();
 	}
 
-	public class SoftwareCursor : ICursor
+	public sealed class SoftwareCursor : ICursor
 	{
 		readonly HardwarePalette palette = new HardwarePalette();
 		readonly Cache<string, PaletteReference> paletteReferences;

OpenRA.Game/Graphics/SpriteFont.cs

@@ -17,7 +17,7 @@ using SharpFont;
 
 namespace OpenRA.Graphics
 {
-	public class SpriteFont
+	public sealed class SpriteFont : IDisposable
 	{
 		static readonly Library Library = new Library();
 
@@ -150,6 +150,11 @@ namespace OpenRA.Graphics
 
 			return g;
 		}
+
+		public void Dispose()
+		{
+			face.Dispose();
+		}
 	}
 
 	class GlyphInfo

OpenRA.Game/Renderer.cs

@@ -91,6 +91,9 @@ namespace OpenRA
 
 		public void InitializeFonts(Manifest m)
 		{
+			if (Fonts != null)
+				foreach (var font in Fonts.Values)
+					font.Dispose();
 			using (new Support.PerfTimer("SpriteFonts"))
 			{
 				if (fontSheetBuilder != null)
@@ -175,7 +178,7 @@ namespace OpenRA
 
 		public Size Resolution { get { return Device.WindowSize; } }
 
-		public interface IBatchRenderer { void Flush();	}
+		public interface IBatchRenderer { void Flush(); }
 
 		public IBatchRenderer CurrentBatchRenderer
 		{
@@ -254,6 +257,9 @@ namespace OpenRA
 			tempBuffer.Dispose();
 			if (fontSheetBuilder != null)
 				fontSheetBuilder.Dispose();
+			if (Fonts != null)
+				foreach (var font in Fonts.Values)
+					font.Dispose();
 		}
 
 		public string GetClipboardText()