* Tables can now have headers (the layouts will require some more work before read to be used formally).
* Finished Market offers display, Item details display, and Item statistics display.
* Added getSelectedWidget to UIRadioGroup class.
Market TODO:
* Create buy/sell offer.
* Purchase sale offer or accept purchase offer.
* More item filtering features (weapons, types, depot only, vocation, etc).
* Item searching feature.
* View your offers (history/current).
* UI touch ups and optimizations.
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