FR: Organization Tools (Foldering, Grouping, Coloring, Searching, Tagging)

[brimwats]

Developer TODO (don't remove)

• create new branch. put issue number at start of name
• update documentation
• merge and delete branch (don't squash because want commit history to see why I made changes)

I have quite a bit of keymaps (over 200!) and it would help a ton if these could be searched, foldered, categorized/tagged, grouped, or colored (ideally, all of these, but basic searching and foldering would be the most helpful!). I'd be happy to elaborate on what this could look like but I suspect its understandable!

[brimwats]

Related to #846

[brimwats]

Potentially also related to #701 #691 and #320 , but this request includes those

[jambl3r]

Groups coming soon, see #670 for searching