DEN-1396 : UI Log Handler
- Added USB Drive Mount/Umount/Removed detection
- Added USB Drive mounting process error handling
- Added USB Button
- Made File Handler a singleton class which is connected to Main Timer to detect USB insertion and remove.
- Added series of connections in ApplicationController, Guicontroller, GuiView, FileHandler.
- Updated TouchRect to be able to notify user for reaction by fading in/out.
- Modified and added button colors for normal and selected.
- Added disabled functionality to the TouchRect
- Added USB button as a test into Home Screen.