Minor fixes: office20, level02 - fixed spawns (for some reason they were random)

Cleaning up purple/red boxes and OP weapons, revamping levels, minor fixes and tweaks:
- space14, space15 are switched with HolyDucks version instead of QC
- bunker02, bunker05, forest13, forest20, industrial04, level01, level06, office04, snow01, space09, space10 are replaced with L&A 2v2 version instead of QC
- added bunker01, city10, city12, office02, office10, space06 from [L&A] 2v2 mappack.
- snow02 - added spawner of pistols instead of single items
- office20 - switched bottom box of chestplate with netgun; removed present at the top; added grenade spawners at the sides instead of single items
- office13 - switched helmet spawner with chestplate spawner
- office12 - reworked middle room; switched purple box with camping rifle box
- snow10 - switched green guns in locked rooms with RC cars
- city05, forest02, level08, [QC-10] Netgun Time!, [QC-80] Stuck in Space, [QC-85] Old Field - removed
- industial01 - switched middle helmet spawner with chestplate; fixed boxes' symmetry

- removed some duel maps