shell: remove "options" concept

Removing help "options" from shell API.

Currently SHELL_OPT macro is not used by users. What is more
commit: a89690d10f1 ignores possible options created in
command handler by the user. As a result they are not printed
in help message.

Second, currntly implemented "options" in command handlers options are
implemented without SHELL_OPT macro.

And last but not least this change will allow to implement
help handler in a way that user will not need to think about calling
functions printing help in a command handler.

Signed-off-by: Jakub Rzeszutko <jakub.rzeszutko@nordicsemi.no>
29 files changed