Hunter Douglas shade plugin v1.12.6 to production

[sjenkins]

Both 1.12.5 & 1.12.6 moved to production,

thanks to @glarsen for the last minute change is the reversal of Open / Close for G3.

I did not touch G2 and need some G2 users to validate the Open / Close function for them as I do not have any.

The rest of the changes made in 1.12.5 were mostly not user facing.  Libraries and documentation changes.

G3 changes:

• I did add an event for battery low but that would have been triggered by the polling info too.
•   The motion stop event seems to not always come across the sse, so I added a timeout clearing at the next polling event.
•   The biggest effort was a rewrite of the sse event engine ; threads necessitate this being non-standard but the way I had written it was absolutely awful to look at.  Significant simplification & clean-up.  I am hoping some of the mystery crashes will go away with this.
• I have changed my polling to every 120s to lessen the traffic.  Did not change the default though ; you may want to play with it. YMMV.

Let me know what you see!

VERSION = '1.12.6'
"""
1.12.6
DONE reverse open / close behaviour for G3 shades

1.12.5
DONE re-write SSE for G3
DONE fix motion if motion-stop missed
DONE battery low event added for G3
DONE force updates to server (helps with new eisy-ui)
DONE doc clean-up
DONE string clean-up
DONE improve logging
DONE bumped requests and urllib3 versions

[GTench]

@sjenkinsOpen and close work correctly on my G2. Have not tested with 1.12.6 yet but should be fine as you indicated that you did not touch G2. If there is an issue I will report back.

Gary

[glarsen]

Open/close now do what they say they will!  Thanks.