Added a mini curses class and generic-multi-select (#362)

* Added a mini curses class. It can do some simple tricks to iterate over menu options and indicate which ones are chosen using generic_multi_select().

* Include the default parameter if set.

* Modified 'select_kernel()' to use the new multi-select.

* Sneaky character got in.

* removed some debugging

* removed some debugging

* Spelling error

* Adding error handling and loop support.

* Enforce that 'default' is always selected if no other option is selected.

* Fixed backspace issues and ghosting.

Co-authored-by: Anton Hvornum <anton.feeds@gmail.com>

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