Small QoL Improvements

[Elkanah]

I'd like tabs to be able to sell multiple items at once, rather than individual clicks after changing 1 category item to xAmount before sell. Let me do multiple of these at once with check boxes or something, and a sell button.

I'd also like a retainer button that allows us to complete all (all those that are showing as completed) to give the items they possess all at once, and then the continuous assign button as well to send them back on their way (as long as you have the ventures for each npc you have), and their last current navigation of what they were doing (ie item they were looking for, quick exploration, long exploration, etc).