Tracker issue: CVR requirements

[hanetzer]

Should work in cvr, most stuff as regards shaders and rigs are the same as in vrc.
two notes:

1. Needs to be SPS-I compatible SinglePassInstancing, discussed in discord [Actually this is more for HoyoToon/HoyoToon and I just goofed]
2. As a convenience, I believe the eye weights need to be adjusted. They look the same as various MMDs and VROIDs I've converted, and will likely have the 'lazy eye' problem. To fix, weight both eyes 100% to the head bone, and then reduce their respective eyebone weights to 50%. shouldn't be too hard.