Add an optional persistent tracker widget/system tray entry that stays on top of other windows

[emanguy]

It's annoying to have to switch between windows when tracking time to check how much time you've spent on an issue. I should add an "always on top" method of keeping track of time, most likely an always-on-top mini tracker window, or if there's a good way to show the current spent time on the system tray I could do that instead.

Requirements:

• Add a button to the time tracking bar at the bottom which pops out the mini-tracker
• Mini tracker should always be on top of other windows
• Add an entry to the settings for auto-launching the mini-tracker
• The mini tracker should primarily show the amount of time spent on the current issue. If there's space, show the issue title and number in small text on the mini-tracker.
• Time spent should be able to be submitted from the mini-tracker.
• If there is space, also provide triggers for the "cancel recording" and "stop and edit" options on the mini-tracker.