In pst, bracelets need to be useable as quick items

 -unlike bg/iwd, there is no 'use item magical ability' button, so there may be other things that need to be able to go in the quick item slots.
Button: consolidate images into an indexable array.
Button: add BUTTON_IMAGE_NONE for quickly clearing all images
Button: no need to be marked “changed” if we didnt change.
Cleanup: remove unneeded #includes from GUI classes.
Cleanup: cleanup unneeded includes in scriptable classes
Merge pull request #9 from chilvence/fixesonly

In pst, bracelets need to be useable as quick items