Simply add_to_sclist() by removing the ability to update a shortcut using the function

Original nano commit: 5079
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5079
Original nano commit message:
	Removing the now unused and unneeded addition ability to the shortcut list.
Update do_yes_no_prompt() to use func_from_key() instead of get_shortcut()

Original nano commit: 5082
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5082
Original nano commit message:
	Using the more direct func_from_key() wrapper instead of get_shortcut().
Update do_linter() to use func_from_key() instead of get_shortcut()

Original nano commit: 5083
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5083
Original nano commit message:
	Using still more the func_from_key() wrapper instead of get_shortcut().
Update some functions in files.cpp to use func_from_key() instead of get_shortcut()

Original nano commit: 5084
http://svn.savannah.gnu.org/viewvc?view=rev&root=nano&revision=5084
Original nano commit message:
	Using still further the func_from_key() wrapper instead of get_shortcut().