R1:e555b9025fcf

Implemented Phrequent time tracking functionality.

Summary:
This differential implements Phrequent's time tracking
functionality for users and hooks it up to Maniphest. It
also includes a basic "Time Tracked" list for the Phrequent
application, where users can review what they've spent time
working on.

Test Plan:
Apply the patch and track some things in Maniphest. They
should appear in the "Time Tracked" view of Phrequent.

There is also a `phrequent.show-prompt` option which toggles
whether to display…