[Custom-Contexts] add options menu for Agument

Hi, all

It’s going to be magic happen if this support be, :slight_smile:
somethimes, we have to handle a lot of agument when we using custom-context.
specially, we need text area input using tts dialplan.

so, it is help to many people

this is example add mune screen.

this i some dialplan with argument handling.

allways thanks for your job