Read Messages from official API

[shbert]

Today I thought first I have a genious idea to see all messages from the controller (usually only visible in the app) by implementing the /messages API endpoint documented in the official API docs.

After a while I detected, that it might have been pretty useless, since not all needed and relevant information is contained in the Messages object. Esp. there is no obvious relation to a device... here my forked branch including messages implementation

So if I'm wrong and my implementation is helpful, I'll create a pull request after a bit more testing.

Open topics:

• test with polling / slow polling
• I saw, that in the session.py the _process_long_polling_poll_result method also reacts on type message. Did not crosscheck if this clashes with my implementation

Just close it, if it is not worth of further following up.

[tschamm]

Sorry, took a while ... I think it's worth integrating your work, would be good if you can create a PR. I will care for the long polling processing.