Update 15.2

[p]IMPROVEMENTS[/p][p]- major engine and input system update[/p][p]- controlled player can now resign as well[/p][p]- election frequency of 8 years for Brazil upper house[/p][p][/p][p]FIXES[/p][p]- no need to resign if running for primaries[/p][p]- appoint new government was buggy in presidential republics[/p][p]- some general UI fixes[/p]