Added encoder project local file to .gitignore
Set Vertex hasWeights when loadBlendData is called

Mesh class assumes all vertices have the same size. On the other hand,
FBX format ignores blend weights and indices when they're zero. This
causes less data written to the output stream than it was indicated
beforehand and the resulting GPB bundle is corrupt.

Fixes #1613
Merge pull request #1615 from rgngl/encoderWeightFix

Encoder blend weight fix