Numerous Changes
About:
-license split into a subview

Preferences:
-cleaned up main preferences view to only hold a few settings
-advanced settings moved to a seperate activity
-added new preferences: bufferMinutes, wakeDevice, silenceAllDay
-cleaned up the code by moving all drawing operations to refreshDisplay()

QuickSilence:
-quick silence feature now works correctly with a toast message and notification indicator
-a bug still exists where the quick silence will cancel if the main activity is started

Icons:
-added initial icons for the quick silence notification
-added icons for the license activity
-changed icon for the about activity