Summary:
The new, styled folder and label picker!
Some highlights:
- Folder picker has custom icons and a divider
- Label picker has checkboxes with off, checked, and intermediate state
- Extracted LabelColorizer out of mail-label
- Search will bold the results it found
- Fixes to Tooltip to prevent it displaying at invalid moments
- Keyboard UX improvements to Menu
Test Plan: coming soon
Reviewers: bengotow
Reviewed By: bengotow
Differential Revision: https://phab.nylas.com/D1790
