Add "Required" items column in the retainer table

[wirchtalksgames]

Is your feature request related to a problem? Please describe. Whenever we're extracting materials that we already had in the retainer, we have to manually search for the required amount on the "To Craft" table, adding an extra verification step to the process.

Describe the solution you'd like Add a "Required" column to the retainer table, just like in the "To Craft" table.

[Critical-Impact]

Implemented, will be in next release. I'm also adding tooltip functionality so you can see how much you should retrieve from a retainer when you hover over an item.