CS easy fixes

[Curvatwo]

-get rid of slots. Make it unlimited.
-Increase the listing fee of high-priced items (gold sink)
-add collect all button
-add "list all" for packs of the same type
-add filters like price range
-add a buyer's side of CS, WTB instead of WTS. Bounties for certain items which take gold at the time of listing, and auto-fulfill when sold (similar to steam)
-7-day listing