Rewrote stings

Stings are now special cases of carbons' clicks
All the problems with stings-items were solved automatically by this
Clicking the ability sets your active sting
Currently active sting is shown on the UI
Changed sting icons to fit the UI
Clicking other ability will reset the active sting to the new one
Added "retract stinger" ability so you can get rid of any active sting
Added autoequip of items below you if you go from monkey to human form
as ling
Added commented-out greater form, just because
Monkeys now have chem counter in their UI just like humans
Monkeys have active sting icon in UI as well
Hope its not too much commits for one pull request
Also changed some of the previous additiong to ABSTRACT items in
show_inv