Feature progress messages and live (10 second delay) updating of the overview panel

Fixes #257 

The progress bars only show up on started games, with the top one being for the game's overall progress and the bottom one being the user's progress. 
(If you want the bars for records on the other game filter/statuses, that's an easy fix.)

And the overview panel now refreshes locally and automatically whenever you vote or set an estimate.
And the overview will now refresh a game's view, when it checks every 10 seconds to see if the game in the database has changed. (If the game's information has been edited or the status has changed, it will refresh the whole panel, and print out a message about what happened. If only the votes/estimates have been changed in the game, only the progress bars and the req panel will update, so it doesn't seem too flashy.)