Optimize controller models

[mkeblx]

Could use an optimized, simplified set of controller models. Right now some quite heavy.

Current model stats:
-Oculus Touch: 0.88MB - 6.9k verts
-HTC Vive: 1.6MB - 8.7k verts
-Daydream: 0.10MB - 0.86k verts
-Gear VR: 0.03MB - 0.21k verts

[dmarcos]

Yep. HTC specially is huge

[feiss]

working on that!