[ ] Let the Application constructor use Service::make_default by default
[ ] Let the Application constructor take factories in any order
[ ] Split UIManager into GraphicsManager and UIManager
UIManager handles the user interface state, i.e. the currently selected channel, the current screen (as a ScreenEnum only) and the state of the octave buttons
GraphicsManager Handles the actual drawing, mapping ScreenEnums to Screens etc.
create_functions tomake_Applicationconstructor useService::make_defaultby defaultApplicationconstructor take factories in any orderUIManagerintoGraphicsManagerandUIManagerUIManagerhandles the user interface state, i.e. the currently selected channel, the current screen (as aScreenEnumonly) and the state of the octave buttonsGraphicsManagerHandles the actual drawing, mappingScreenEnums toScreens etc.