Fixed 'upon gaining unit' trigger activating for all units

modding: 'Only available when' applies to beliefs

Better promotion positioning in unit overview

Stat updates propagate where they didn't before

Hide bombard notification after bombarding

By SomeTroglodyte:
- Desktop starting size fix
- Fix stats reward for GP consumption escalation
- Fix Great Person Create Improvement w/ Resource

By Gualdimar:
- Victory screen fixed button position
- Fixed foreign city religion table exploit