Disguise buff

Damage resistance while disguised. But to make things more interesting, following rules applied:

- disguise as slower class provides higher damage resistance, than as light
- disguise blocks critical hits and reduces regular damage only for damage type of that class.
- friendly disguise has higher damage resistance than enemy disguise.

For example, disguising as Heavy provides 20% bullet damage resistance and melee damage resistance. Disguise as Pyro - 10% fire and melee damage resistance. Disguise as Scout - 5% bullet and melee damage resistance.

For friendly heavy, pyro and scout disguises numbers will be 25%, 15% and 10%. Critical hits now remove disguise with matching damage resistance, so spies can't absorb kritzkrieg ubers for their teammates.

Disguise buff