Update 0.17.1

Small update, mainly to rebalance some thins

Changelog

• Tech cost doubled

• Era techs no longer cost stability, but require 50% of previous tier techs/culture to be researched

• Culture tech stability gain from factions divided by four

• New warnings for unrest

• Bug fixes

• New "Resolution Scale" setting for lower end PCs

• Slight UI changes to diplomacy screen