[Trade] Add favorite search presets

As in the title.

Add an option to "save" your trade search. Especially useful for buying maps.

For example you specify:
-instant buyout only
-tier 16-16
-rarity: rare
-iiq 105
-iir 140
-NOT filters such as no reflect, no ailment evasion etc.

its a lot of clicking to do from scratch every time.