Provide buffer size in ShpRemasteredSprite.

As the expected size is quite small here, providing an explicit buffer size helps as otherwise default buffers for 1024 characters are allocated by the StreamReader which must be cleaned up by the GC afterwards. These smaller buffers still need cleanup but waste less memory.

OpenRA.Mods.Cnc/SpriteLoaders/ShpRemasteredLoader.cs

@@ -97,14 +97,21 @@ namespace OpenRA.Mods.Cnc.SpriteLoaders
 					var metaStream = metaEntry != null ? container.GetInputStream(metaEntry) : null;
 					if (metaStream != null)
 					{
-						var meta = MetaRegex.Match(metaStream.ReadAllText());
+						string metaText;
+#if NET5_0_OR_GREATER
+						using (metaStream)
+						using (var metaReader = new StreamReader(metaStream, bufferSize: 64))
+							metaText = metaReader.ReadToEnd();
+#else
+						metaText = metaStream.ReadAllText();
+#endif
+						var meta = MetaRegex.Match(metaText);
 						var crop = Rectangle.FromLTRB(
 							ParseGroup(meta, "left"), ParseGroup(meta, "top"),
 							ParseGroup(meta, "right"), ParseGroup(meta, "bottom"));
 
 						var frameSize = new Size(ParseGroup(meta, "width"), ParseGroup(meta, "height"));
 						frames[i] = new TgaSprite.TgaFrame(tgaStream, frameSize, crop);
-						metaStream.Dispose();
 					}
 					else
 						frames[i] = new TgaSprite.TgaFrame(tgaStream);