Tooltips

[BlinkVonDoom]

This adds a table for quarter totals and calendar tabs.

Test:

• [x] Ensure when changing between table tabs the calendar updates
• [x] When scrolling between years, ensure table tabs change
• [x] Request time off, make sure calculations have not broken

Closes #153 Closes #151 , moving #152 to its own milestone

[Steaphan-Sadler]

Every time you click on 2020 tab, calendar jumps to January 2020, even if you're in 2020 already. But all works appropriately. Tooltips also all work as appropriate.