The two handed component, while useful, has quite a bit of bloat that gets replicated whenever a new class of 2h items is added.
This PR cuts that bloat by replacing the use ofCOMSIG_TWOHANDED_WIELD and COMSIG_TWOHANDED_UNWIELD as ersatz callbacks with actual callbacks, the replacement of various var/wielded defs on items with a check for HAS_TRAIT(src, TRAIT_WIELDED), and the removal of any now-unnecessary on_wield()/on_unwield() procs that simply toggled those wielded vars
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