Fix TS offsets, selection bounds, weapon factory exits
Make the RA/D2K/TS map chooser layout consistent with the lobby.
Fix Footprint, DockOffset, SpawnOffset and spawn Facing of TS refinery
Tweak TS barracks SpawnOffset and ExitCell
Merge pull request #6670 from reaperrr/ts-offsets01

Closes #5905
document traits with generic names
Merge pull request #6676 from pchote/map-chooser-layout

Make the RA/D2K/TS map chooser layout consistent with the lobby.
Merge pull request #6681 from Mailaender/document-basic-traits

Documented traits with generic names
Use the existing SpriteLoader cache for tilesets.
Use SpriteLoader for frame exporting.
Remove --transpose utility command.

The engine has supported transposed sprites for a long time now.
Add plumbing for mod-defined sprite loaders.
Move ShpTD sprite loading into Mods.Common.
Move ShpTS sprite loading into Mods.Common.
Move R8 sprite loading into Mods.D2k.
Move TmpRA sprite loading into Mods.Common.
Move TmpTD sprite loading into Mods.Common.
Move TmpTS sprite loading into Mods.TS.
Move ShpD2 sprite loading into Mods.Common.
Remove the remaining legacy sprite plumbing.