Enable reload

[gigatexel]

I'm aware that this will probably not get merged, but I'm still creating this PR for those who are intensively making Loxone Config changes and need to rapidly merge these changes with HA.
If you need or would benefit from a reload function, use the the changes in this PR.

The proposed changes are running error & warning-free on my install for some time now.

init.py

• Calls the stop() function
• Removes all services
• Unloads all platforms
• Removes orphaned entities/devices that are no longer present in Loxone. Not doing this results in unavailable entities and non-removeable devices
• Starts the integration by default
• Fully closes all listeners to avoid duplicates

api.py

• Create locks for websockets to avoid race conditions and reads on closed sockets
• Stop all background tasks to avoid duplicates when reloading

scene.py

• Give the entities a real uniqueid instead of the uuid

[gigatexel]

Added a release in this repo for those who need it: https://github.com/gigatexel/PyLoxone