General:
- Rename control mode MENU to MENU_SETTINGS
- Add new control mode MENU_MODE_SELECT
Button menu:
- change 'long press' to: 'switch to menu mode-select'
- move 'open settings menu' to 5x press
Display:
- display_task: outsource statusScreen to local function
- display_task: also handle MENU_MODE_SELECT control mode
- show display startup message for 2600ms instead of 2000ms
Menu:
- Add functions to handle modeSelect menu to select from a list of allowed modes
(similar to settings main menu)