[cpp] Fix JSON parsing of transform constraint timelines, path constraint mix timeline constant. Closes #2736

spine-cpp/spine-cpp/include/spine/PathConstraintMixTimeline.h

@@ -61,7 +61,7 @@ namespace spine {
 		static const int ENTRIES = 4;
 		static const int ROTATE = 1;
 		static const int X = 2;
-		static const int Y = 2;
+		static const int Y = 3;
 	};
 }
 

spine-cpp/spine-cpp/src/spine/SkeletonJson.cpp

@@ -1278,7 +1278,7 @@ Animation *SkeletonJson::readAnimation(Json *root, SkeletonData *skeletonData) {
 			mixY = mixY2;
 			mixScaleX = mixScaleX2;
 			mixScaleY = mixScaleY2;
-			mixScaleX = mixScaleX2;
+			mixShearY = mixShearY2;
 			keyMap = nextMap;
 		}