Check return value of wait_for_active

[AnthonyHorton]

Should check return value of .wait_for_active(timeout=<input timeout>) calls to see if they timed out or not, and raise an exception if so.

The .wait_for_active() methods of gpiozero devices call the .wait() method of an internal threading.Event (see https://gpiozero.readthedocs.io/en/stable/_modules/gpiozero/mixins.html) and that methods returns True if the Event was set or False if it wasn't (i.e. it timed out): https://docs.python.org/3/library/threading.html#threading.Event

Will need to address #42 prior to this otherwise it will break the simulator (which currently relies on timeouts).

This will be needed as part of #39.

[AnthonyHorton]

Oh, this is effectively a duplicate of #32

[wtgee]

Oh, this is effectively a duplicate of #32

You capture some good information here so would be good to incorporate into #32.