adds the mime mech

Conflicts:
	code/game/mecha/equipment/weapons/weapons.dm
	code/modules/projectiles/projectile/bullets.dm
	icons/mecha/mecha.dmi
	icons/mecha/mecha_equipment.dmi
support for alternate mecha step sounds
better sprites and code for mime mecha

Conflicts:
	code/game/mecha/mecha_wreckage.dm
	icons/mecha/mecha.dmi