Necromancer and Mercenary classes added

The Necromancer has been added to the game. A master of dark arts, the necromancer has can raise fallen enemies as skeletal slaves to serve him after their death.

The Mercenary has been added to the game. Tired of being a random hire, the mercenary has finally stepped up to take on the adventure himself. Leveraging his pistols, the mercenary shows no mercy and will collect every bounty.

Also fixed some resolution issues with big menus.