Feature/buzzer

Please check if the sounds are in the correct states, and/or if any states are missing sounds. "Keybeep.wav" is just a simple beep, adequate for keypresses. "yes.wav" is saying "Yes!". Used for Start State. "ok.wav" is saying "okay". Used on door close. "ohoh.wav" is exactly that - is used for cancel and dooropened. "no.wav" is also available for the same purpose, but is not used. "done.wav" is a very significant sound that should be hard to ignore. Used for done state.

Test will only show about 63% due to gitlab runners not being able to test sounds. There is proof of 100% coverage available from Fine Code Coverage.