Added unequip weapon functionality.
Refactored attack button.
Refactored trade button.
Refactored wait button.
Refactored heal button.
Refactored use item button
Refactored equip weapon button.
Refactored unequip button.
Refactored discard button.
Refactored items (renamed to inventory) and item listing buttons
Post-refactoring cleanup. Renamed some button files for organization.