Update do_select_screen for general use, apply to some screens

[thinkyhead]

The current do_select_screen method requires supporting code to define a bool, check for controller events, properly handle the click, and so on. This PR gathers all the select screen code together so that the selection screen can be re-used with no extra SRAM cost since it re-uses the single bool for all selection screens. Instead of getting the result of do_select_screen and acting upon that, we now pass a "yes" handler and a "no" handler. The handlers can either be void function(void) pointers or lambda functions. Both types are used in the examples included here.