fix issues with texture loading

patches/Terraclient/ReLogic/Content/Readers/PngReader.cs.patch

@@ -0,0 +1,32 @@
+--- src/Terraria/ReLogic/Content/Readers/PngReader.cs
++++ src/Terraclient/ReLogic/Content/Readers/PngReader.cs
+@@ -40,12 +_,27 @@
+ 			texture2D.SetData(value, 0, num);
+ 			return texture2D as T;
+ #else
++			// tML code:
+-			var img = Image.Load(stream);
++			/*var img = Image.Load(stream);
+ 			Image<Rgba32> bmp = img.CloneAs<Rgba32>();
+ 			bmp.TryGetSinglePixelSpan(out Span<Rgba32> colors);
+
+ 			Texture2D texture2D = new Texture2D(_graphicsDevice, bmp.Width, bmp.Height);
+-			texture2D.SetData(colors.ToArray());
++			texture2D.SetData(colors.ToArray());*/
++
++			// Terraclient:
++			Texture2D texture2D = Texture2D.FromStream(_graphicsDevice, stream);
++			int num = texture2D.Width * texture2D.Height;
++			if (!_colorProcessingCache.IsValueCreated || _colorProcessingCache.Value.Length < num)
++				_colorProcessingCache.Value = new Color[num];
++
++			Color[] value = _colorProcessingCache.Value;
++			texture2D.GetData(value, 0, num);
++			for (int i = 0; i != num; i++) {
++				value[i] = Color.FromNonPremultiplied(value[i].ToVector4());
++			}
++
++			texture2D.SetData(value, 0, num);
+ 			return texture2D as T;
+ #endif
+ 		}

patches/Terraclient/Terraria/Terraclient/CheatHandler.cs

@@ -11,7 +11,7 @@ public static class CheatHandler
 		public static string Version => TerraclientVersion + TerraclientVersionEx;
 
 		private static readonly Version TerraclientVersion = new(0, 0, 1, 0);
-		private const string TerraclientVersionEx = " alpha-21w20a";
+		private const string TerraclientVersionEx = " alpha-21w20b";
 
 		internal static List<Cheat> Cheats;