added refreshFields() to ContainerFields
added a message object parameter to Field:activate(), focus() and deactivate() methods
added anti-stupidity measures to InputButtonField and InputKnobField
fixed some multi-inheritance order mixup (yay! lua hacks)
replaced unnecessary importing of the common.dimensions module
removed unnecessary stop_processing variable from handleButtonInput() methods
fixed MainMenuPage
added PAGE_PADDING static member to ServicePage
wrote in-code documentation for members and methods