Open and Drop by button and command

support battery and old LED

Merge pull request xyzroe#6 from Utyff/Utyf

fix button hold

Merge pull request xyzroe#4 from nurikk/patch-1

Update README.md

Merge pull request xyzroe#4 from nurikk/patch-1

Update README.md

added TimeBell attribute than means time after last bell to finish ring

Some major fixes:

1. Fixed a call detecting mechanism, which led to a call cliff during a conversation or opening the door, which sometimes prevented open the door. (In some cases, it did not open at all)
2. In battery mode, the sleep mode is fixed - it is now possible to open the door.
3. In the battery mode, change the sound mode by the button is disabled, because 'no sound' mode on the battery is in development.

updated EVT_ID thanks to @Anton_ACE

updated readme `battery mode` part

updated external converter
updated some images