Insert a convenient Buy button and Sell button on item menus
Add a Buy button and a Sell button to item context menus.
This should save a few extra clicks when wanting to mass sell/buy items.
The Buy button will trigger these sequence of events:
1. Click 'View Marketplace'
2. Click '+ New Buy Listing'
The Sell button will trigger this sequence of events:
1. Click 'View Marketplace'
2. Click '+ New Sell Listing'
