Smart search bar

[ghost]

I don't expect this PR to be merged.
Opened it to share some code and ideas, maybe start a discussion on how this feature should be implemented.

Code here fully replaces UI filters with filter bar. Quick filters still work.
I think I like it more, but I imagine that most people will prefer UI filters to avoid typing lots of text.

Here's my main findings so far:

1. Some kind of autocomplete is neccessary to help remember tags and labels, this will be especially relevant when new tags will be eventually released.
2. Highlighting keywords like 'tag', 'type', etc. in filter bar with different colors would be nice. But it's not possible with vanilla input fields, so custom solution is required.

[ghost]

Basic filters:

Quick filters:

Saving search terms:

[ghost]

Implemented autocomplete, well, not really, it's not interactive, just showing you all available options.
Keyboard and mouse interactivity is possible but tricky, i'll try it later.