Chapel improvements.
Added Watson sprites as per: http://baystation12.net/forums/viewtopic.php?f=33&t=9247
Fix so that custom sprited borgs don't spawn as a cardborg
Commiting Michael Guess's pendant: http://baystation12.net/forums/viewtopic.php?f=33&t=9367
Papadrow's custom dress for lillian: http://baystation12.net/forums/viewtopic.php?f=33&t=9363
stealthfix
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into dev
Fixes for https://github.com/Baystation12/Baystation12/issues/4173 , https://github.com/Baystation12/Baystation12/issues/4168 , https://github.com/Baystation12/Baystation12/issues/4159 , and https://github.com/Baystation12/Baystation12/issues/4038
Cleanbot/dirt fix.

Now if a cleanbot cleans a tile, it will also set it's dirt value to 0
so a person walking back over the tile won't instantly create more dirt.
Merge pull request #4230 from Ccomp5950/dirt_nerf

Cleanbot/dirt fix.
Merge pull request #4235 from Faerdan/dev

NanoUI fix
Merge pull request #4227 from DJSnapshot/hotfix

Map fixes
More elegant solution to dirt getting in the way.

Who needs to click dirt anyway?

Signed-off-by: Mloc-Argent <colmohici@gmail.com>
Merge pull request #4239 from Mloc/bs12-finestdirt

More elegant solution to dirt getting in the way.
Patched holes in SoftDelete that were causing null reference errors.
Fixes #3892
Tweaks the zone rebuilding logic to prevent doors being ignored.
Fixes #4046
RCDs no longer create plating with air on it.
Fixes #3545
Merge pull request #4217 from DJSnapshot/dev

Custom stuffs!
Merge pull request #4241 from Faerdan/dev

Minor fix for NanoUI
Merge pull request #4210 from RavingManiac/dev

Chapel improvements.