Invert search

[Myzel394]

Hey,

it would be really cool if you could invert the search. For example to invert "hello", you enter: "!hello" or ":not(hello)"

[ambroisie]

Similarly, I think being able to exclude tags/trackers/etc... would be good.

We can already OR tags by holding Ctrl (so e.g: seeding OR cross-seed by clicking one, then holding Ctrl and clicking the other). I'd like to be able to search cross-seed AND NOT(seeding) by e.g: clicking twice on seeding to exclude it from the search.

[ambroisie]

Similar to #797.