Added handling for space travel/stragglers.
Now new empty space levels are created if needed.
Added config option to use overmap system, ticked files in.

Conflicts:
	code/setup.dm
Added caching of zlevels.
Currently only condition to cache them is lack of client mobs there.
Updated templates for nanoUI changes.
Merge pull request #6088 from Baystation12/dev

Dev
Double airlock into space~, nanananana, so intense
Fixes #6038. Adds a missing '
Adds simple load balancing
Fixes fore solars control room area

Also changes solar area requires_power and always_unpowered to match
area/space
Merge remote-tracking branch 'upstream/dev-freeze' into power-net
Brig Fixes Clean

Includes all the previous fixes, plus removes loyalty implants from HoS
locker
Improves rand_zone() and miss chance procs
Fixes apply_effect() used without armour checks
Fixes human armor value for full body effects not being weighted by body part

This was an issue because it meant that not having hand or feet
protection reduced the player's protection from full body effects much
more than it should have, and meant that not having your hands protected
was just as bad as not having your chest protected.
Fix for rad suits not protecting against radiation

Rad suits were not providing complete protection from radiation. This is
probably not the best solution. Better solutions would be to either add
the HANDS and FEET coverage flags as done here in addition to updating
the sprite to reflect the additional coverage, or to add radiation proof
gloves and boots as part of the radiation suit set (potentially
problematic for taj and unathi engineers).
Merge remote-tracking branch 'upstream/dev-freeze' into dev-fixes

Conflicts:
	code/game/objects/structures/stool_bed_chair_nest/wheelchair.dm
Merge pull request #6105 from Raptor1628/dev-freeze

Brig Fixes Clean
Merge pull request #6097 from PsiOmegaDelta/DoubleDoor

Fixes #6096
Merge pull request #6098 from PsiOmegaDelta/Pref

Fixes #6038
Fixes #6106 and prevents placing a mountain of humans on the same op-table.
Corrects the mapping issue of #6111.

Reduced the access requirement from CE to engine access.