Set definitions set_list, on_set_complete, and on_set_broken can now be tables of several different actions to take for different set ids
Made set_list able to be a function
Sets can now check against a specific inventory slot

revert acidic skin; if oozemancer melee protection needs reducing we can do better than bland'ing a talent :)

to be much tested, most work by housepet

Savefiles from 1.1.5 are not compatible, added a message to display this with a link to download 1.1.5