removed pointless sed for .desktop for DEB

we don't hard-code the path to the binaries anymore
disabled art for textfields
darker wine red for the highlighted button
replaced the yellow highlighted placeholder everywhere
Merge pull request #4011 from Mailaender/uibits

Additional polishing for UI buttons
Merge pull request #4009 from Mailaender/deb-rm-fail

cleaned up the DEB packaging script
Fix biolab ownership in East vs West 3.

Change Creeps -> Neutral to prevent units from attacking it by default.
Allow engineers to repair structures.
Merge pull request #4014 from pchote/engineer-buildings

Allow engineers to repair buildings (C&C)
specify map folders in mod.yaml

closes #3544
CamelCase for FileSystem folder
StyleCop cleanup
translate ^ and ~ as FileSystem.Mount does
Split MLRS damage across 8 rockets for nicer visuals.
Remove building explosion sound from MLRS.
Add grenade toss sound (from C&C demo).
Merge pull request #4015 from pchote/weapon-polish

C&C weapon polish
load maps only from MapFolders defined separately in mod.yaml
Use proper tile ID for RA anthills
Merge pull request #4019 from cjshmyr/tilesetfix

Fixes #3865