feat(TU20/21): Implement la's TU21 patch file

This adds the following:

TU20:
1. Librarians now have a small chance to offer name tags for sale
2. Witches can now spawn at light level 7 or less in any biome or cave
3. Skeletons & Wither Skeletons now rarely spawn anywhere in the Nether

TU21:
1. Minecart entity limit increased

Minecraft.Client/HumanoidModel.cpp

@@ -241,7 +241,7 @@ void HumanoidModel::setupAnim(float time, float r, float bob, float yRot, float
 
 		if (riding)
 		{
-			if(uiBitmaskOverrideAnim&(1<<eAnim_SmallModel) == 0)
+			if ((uiBitmaskOverrideAnim&(1<<eAnim_SmallModel)) == 0)
 			{
 				arm0->xRot += -HALF_PI * 0.4f;
 				arm1->xRot += -HALF_PI * 0.4f;