Add blend shapes support #440
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- shape geometry is used in blend shapes
- wip
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This PR adds basic support for blend shapes, this is what they does:
For now, the blending is done on CPU and it is not very fast. Proper GPU support will require some renderer refactoring to utilize transform feedback feature to bake blend shapes + bone animation into a temporary vertex buffer and use it for rendering. Ideally this could be done using compute shaders, but since the engine is also targeting on Web, transform feedback is the only viable option here.
Fixes: #223