Fix for Octoprint 1.8.3 update

Rebuilding all Ajax POST request for matching with new security rules (CORS) of Octoprint 1.8.3 and newer.
And fix a bug during multiple bridge selection

Add delayed shutdown delay settings

1.5.0

Add delayed shutdown delay

Support for non official bridge with different port

1.4.2

get port from deCONZ discovering service

Adding deCONZ discovering service

1.4.1

add deCONZ discovering

Adding menu for selecting a bridge when multiple are found

1.4.0

add list when multiple bridges are founds

Fix shutdown on restart

Based on the plugin events no difference can be made between a octoprint software restart, system reboot or system shutdown. All will get the "Shutdown" event. Only on system shutdown a power-off is acceptable.

While not clear how to detect the system shutdown, disable the power_off on shutdown event.

USB disconnection before shutdown

Merge pull request #37 from Salamafet/dev

USB disconnection before shutdown

Auto connect time

Add an option to choose the time to wait before trying to auto connect.

Minor bugfix

Thanks to bitkeeper

Bridge IP refinder

Possibilities to re find for the Bridge IP when this one is unreachable.
Create delay before checking Ophom configuration when page load for preventing Octoprint page crash.