Mod checker accepts era for unit type

AI Declaration of Friendship rework  - By tuvus

By SomeTroglodyte:
- A "Status" column for City Overview
- Fix maximum window bounds for zoomed-in displays
- Generic Widget/Provider framework for sortable grids

Remove Faith bonus from Vanilla Siam  - By SpacedOutChicken

Unit tests for Battle.kt  - By Framonti