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.