LilYGO T-Display simple menu

Video DEMO: https://www.youtube.com/watch?v=5ejPmaOgD1c

TODO

• Add a simple menu
• Move page handler to a separate class
• Implement a button abstraction (reInitButtons, buttonsInit)
• Sub-menu example
• Brightness control example
• WiFi scan menu example
• Implement a menu(items) abstraction