Implement pipe mode?

[domsson]

Some people might prefer to not have succade run lemonbar for them. Instead, they might prefer to use succade just to generate the required string, then pipe that to lemonbar. We should implement an option to do this, for example via -p (pipe or print) command line option.

[domsson]

Thinking about it a little more, I'm not sure this is a great idea. It breaks the way we handle action commands (clickable areas) entirely and would require an alternative approach just for pipe mode (or simply don't support clickable areas in pipe mode).