Merge remote-tracking branch 'origin/samual/orthoview'

Merge remote-tracking branch 'origin/samual/orthoview'

* origin/samual/orthoview:
  Use vec3 and get rid of FL2VEC -- This function didn't exist when I first made orthoview :)
  Lets just set resolution via a cvar
  Fix issues with FL2VEC
  Fix remaining known issue with orthoview (on abyss, techassault)
  Add definition for orthoview accuracy, plus some final cleanup
  Clean up debug stuff
  Add "set" for orthoview cvars
  Add cvars to defaultXonotic.cfg
  Use r_drawfog 0 while in orthoview
  Fix center of map and distance setting
  On second thought, keep the override cvar
  Use center of world bbox instead of '0 0 0' origin, solves a bug :D
  Fix it so that fov adjusts properly too
  Clean up orthoview maths, add logic for handling r_nearclip and r_farclip
  Working on adding orthoview feature for map screenshots from above