[lldb] Refactor command option printing (#178208)
So I have an easier time fixing #177570.
Changes I have made:
* Init a variable inside if statement to reduce scope.
* Added const to some variables.
* Early return if we print a single line, and dedent the "else" that
handles multiple lines.
* Only convert lldb's short codes into ansi codes once.
* Rename a couple of variables where they could have either referred to
the visible text or the raw data with the ansi codes in.
