Support for blinds with rotate-able slats (with one AM43 acting as rotation & one acting as open / close)

[neil-morrison44]

• I'll probably take a look at this myself once my second motor arrives & I figure out a way to mount the AM43s in a line with the lower one's cord going around...

• https://developer.apple.com/documentation/homekit/hmcharacteristictypecurrentverticaltilt, Homekit has support for "slats" so there'd need to be some way in the config to say that Motor Id X and Y are on the same window with Y being vertical (or horizontal) slats

(just setup the single AM43 and it's working fine so far, Raspberry Pi 3 - I've not had it on long enough to encounter the unpairing timeout)