Promote Profit tab to Trade board

[jaghaimo]

New board - Trade. Customizable filters in Configure tab, current results in Results tab, and System tab for quick view tab / current system overview.

Tables in Results and System tabs to be configurable (select fields to display, and select fields, multiple, to sort by).

• System - all profitable routes within the system you are in; kinda quick-peek into what you can do (and earn) in the current system; disabled if in hyperspace
• Sector - all profitable routes within the whole sector; top X most profitable
• Routes - like Sector but you specify source planet (nearest by default), and target planet; shows what you asked (so net difference)
• Stock - current profit tab but better, aka configurable (see below)
• Config - filters and settings for Stock tab