Show numbers on attack damage, show final strength comparison

Show numbers on attack damage

Damage gets randomness as input

Changed Windows icon for Unciv to new icon

Resolved  - unit icons no longer overlap unit action images, improved render time for unit images

MoveTo image visible - 

AbsoluteUnits - Unique Triremes  - By letstalkaboutdune

By vegeta1k95:
- Fix foreign units flags fading 
- Fix AI being able to bombard non-visible tiles + optimizations 
- Modding: allow custom ResourcePortraits