Fixed rotation order bug in BVH Loader

This bug has been present since after the 4.10 release.
It fixes the issue "play the bvh error" #2187
Almost all bvh files are affected, such as any of the CMU library.
The bug is caused by the introduction of channelMap in the BVHLoader.cpp - function void BVHLoader::CreateAnimation(aiScene *pScene).  The channelMap loses the rotation order present oin the BVH file, and always applies the rotations in X,Y,Z order.

code/AssetLib/BVH/BVHLoader.cpp

@@ -493,37 +493,30 @@ void BVHLoader::CreateAnimation(aiScene *pScene) {
             for (unsigned int fr = 0; fr < mAnimNumFrames; ++fr) {
                 aiMatrix4x4 temp;
                 aiMatrix3x3 rotMatrix;
-                for (BVHLoader::ChannelType channel = Channel_RotationX; channel <= Channel_RotationZ; channel = (BVHLoader::ChannelType)(channel + 1)) {
-                    //Find channel in node
-                    std::map<BVHLoader::ChannelType, int>::iterator mapIter = channelMap.find(channel);
-
-                    if (mapIter == channelMap.end())
-                        throw DeadlyImportError("Missing rotation channel in node " + nodeName);
-                    else {
-                        int channelIdx = mapIter->second;
-                        // translate ZXY euler angels into a quaternion
+				for (unsigned int channelIdx = 0; channelIdx < node.mChannels.size(); ++ channelIdx) {
+					switch (node.mChannels[channelIdx]) {
+                    case Channel_RotationX:
+                        {
                         const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
-
-                        // Compute rotation transformations in the right order
-                        switch (channel) {
-                        case Channel_RotationX:
-                            aiMatrix4x4::RotationX(angle, temp);
-                            rotMatrix *= aiMatrix3x3(temp);
-                            break;
-                        case Channel_RotationY:
-                            aiMatrix4x4::RotationY(angle, temp);
-                            rotMatrix *= aiMatrix3x3(temp);
-                            break;
-                        case Channel_RotationZ:
-                            aiMatrix4x4::RotationZ(angle, temp);
-                            rotMatrix *= aiMatrix3x3(temp);
-                            break;
-                        default:
-                            break;
+                        aiMatrix4x4::RotationX( angle, temp); rotMatrix *= aiMatrix3x3( temp);
                         }
-                    }
-                }
-
+                        break;
+                    case Channel_RotationY:
+                        {
+                        const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
+                        aiMatrix4x4::RotationY( angle, temp); rotMatrix *= aiMatrix3x3( temp);
+                        }
+                        break;
+                    case Channel_RotationZ:
+                        {
+                        const float angle = node.mChannelValues[fr * node.mChannels.size() + channelIdx] * float(AI_MATH_PI) / 180.0f;
+                        aiMatrix4x4::RotationZ( angle, temp); rotMatrix *= aiMatrix3x3( temp);
+                        }
+                        break;
+                    default:
+                        break;
+					}
+				}
                 rotkey->mTime = double(fr);
                 rotkey->mValue = aiQuaternion(rotMatrix);
                 ++rotkey;