WIP for using ScreenManager for managing main views and home screen
ain views under ScreenManager, selecting transitions
WIP for homepage tiled icons
added titles below icons; made tile icon draw a colored border
refined colors
enabled home screen, captured esc key to go back out to home screen, integrated it with main menu' .
custom scroll container with persistent scrollbars
wired up events so homepage icons work
fixed rcpserial messagelistener init when port specified on command line
race track view is selected by default when app starts up