Make FACT buildable when "Build Everything" is turned on
Merge pull request #2760 from ScottNZ/devmode

Make FACT buildable when "Build Everything" is turned on
make classic production queue speedup less error prone

- avoid float modifiers because of rounding errors and desync
- try not to crash when the last production building is gone
- don't do LINQ queries on selfsame buildings if not required
Merge pull request #2761 from Mailaender/production-speedup-hotfix

Fixes #2753 ClassicProductionQueue related crashes
Fix crash in CaptureActor.Tick when trying to capture a dead actor