Add support for more states, such as "active" for timers

[Grayda]

This is another partial fix for #88 and a complement of sorts for #95

This PR adds a bunch more states that would be considered "on" for the custom icons entity. I did this because I have some washer / dryer timer helpers and want to show a green icon when the timer is running without having to make a template sensor in my HA instance.

I've tested it with my timers, and it works great. I haven't tested the others I added (charging, home, locked, open and opening) because I don't have anything that uses those device_classes