This commit include lots of changes for pose editor.
Before, we use buttons to represent the transform controller for bones;
Now, we use nodes and edges to represent the bones, just like the nodes and edges for representing the guide spheres for mesh generating. There are advantages by doing this. Firstly, The edit UI for both mesh and pose are unified, secondly, it is possible to set a reference sheet for pose editing now, this is very important.
This new pose editor is inspired by the Eadweard Muybridge's work.
The difference between tetrapod and generic is that, with tetrapod, all the bones need to be generated are know before mark, so if some marks are missing, there would be a message prompted; with generic, you can mark what ever marks as you wish, and the algorithm is try to create a spine and the limbs growing on the spine, that means, the generated skeleton would be some kind of creature.
Many source file name and data type are prefixed by "skeleton" before, now all are refactored.
The class MeshResultContext represents the outcome of mesh generation before, now we have material, pose and animation, so we just rename it as Outcome.
Jeremy Hu