Heavy and Pyro should be able to use Shotgun as Primary weapons

Opens up a whole new subclass for both of them

Plus, gives Pyro an alternative against other Pyros and Demoknights without sacrificing mobility

Besides, what's the point of having two weapons for inflicting afterburn when the Flare Guns can inflict it at range?

Heavy and Pyro should be able to use Shotgun as Primary weapons