classes: move some files around
classes spritesmith #37 move from using *_warrior_0 for all "blank"
items, to *_base_0. Any left-over {type}_{class}_0 now are
significant (eg, weapon_*_0, as well as shield_rogue_0). This is
necessary for proper traversing up/down class shop, and allows for
completely random item deletions on death.