Added explanation of how openedby msg is triggered; reworded some comment for clarity; added maximum lookback and exception msg

staged deleted files; changed door opener field back to 'openedby' since there's an unknown ongoing broadcaster using 'opener'

add door history recording and an endpoint to expose it

See merge request !2

add door history recording and an endpoint to expose it (only toggled on for UCC right now) also handle a lot of the /state endpoints in one reused function.

add timestamp endpoint

See merge request !1