Clean up, do TODO, fix TOFIX

[vatro]

Clean up + do TODO / fix TOFIX only issues things that cannot be moved to 1.0.0-next.X. If something cannot be resolved within an hour, create a new issue for 1.0.0-next.X, we want to get 1.0.0-next.1 out asap.

• [x] Close #11
• [x] Close #71
• [x] Try to close #72
• [x] Close #77
• [x] Close #84
• [x] Close #116
  • [x] Close #108
• [x] Close #111
• [x] Close #120
• [x] Close #121
• [x] Close #122
• [x] Close #109
• [x] Close #94
• [x] Close #123

WebGLRenderer

• [ ] Close #85
• [ ] Close #86
• [ ] Close #22