Merge branch 'TimePath/csqc_viewmodels' into 'master'

Clientside viewmodels

Known issues:
- [x] appears when dead
- [x] appears during intermission
- [x] does not take on effects from powerups like strength
- [x] no switch animation
- [x] vortex does not display charge
    - [x] spectating players: weapons have wrong glow
- [x] arc animates in a strange way noticeable with higher ping
- [x] cl_bobmodel (really? yeah really)
- [x] weapons not visible from spectate until you have spawned at least once
- [x] origin is wrong with cl_followmodel
- [x] muzzleflashes are missing

See merge request !250