Initial implementation of indicators.
Start working on an IndicatorTray.
Add a default indicator image.
Start adding drawing code for IndicatorTray.
Add general update function in IndicatorTray.
Let Indicators handle left-click events.
Add IndicatorTray to main module and fix errors.
Fix some IndicatorTray drawing issues.
Connect IndicatorTray to WindowManager better and add a test indicator file.
Add method to load default Indicators.
Create an icon for a shutdown indicator.
Load a dummy Indicator; begin working on PowerIndicator.
Add IndicatorDB module.
Delete shutdown.png
Delete shutdown.svg
Delete PowerIndicator.py
Delete TestIndicator.py
Merge indicators branch into master.