Global Marketplace - Utility

First of all thank you for having made the Global Marketplace work.

I don't know if I'm stating the obvious, but my suggestions for the GM search filter options are:

- sort by civilization
- sort by min/max price
- sort by stacks
- sort by damage/speed/health/protection/train/attack rate etc.

also a wishlist for when the thing you need isn't listed.

Example: WTB Epic Councilman Onesiphoros > no sales on the GM > put the advisor on the wish list > next time the GM is opened it will show a notification saying "Councilman Onesiphoros has been put up on sale!"

Also, as @PedroAlmeida72 said, more sell slots wouldn't hurt.

feel free to share other good features that would improve the GM!