pmset-simulator: add state 'attached'

See
https://github.com/nojhan/liquidprompt/issues/326#issuecomment-66120495
pmset-simulator: strong quoting of here-docs
Battery/MacOS X: strong quoting for status value

The status value may be 'AC attached', so we have to properly quote to
avoid spaces.
Battery/MacOS X: replace fuzzy matching with strong matching

As we now have a strong simulator, we can replace fuzzy matching on
status values with exact matching.