remove hangouts.users state, simplifies hangouts.conversations

[hobbypunk90]

Description:

removes the hangouts.users state, it is nice to read for devs, but completely useless for users and confusing.
simplifies the hangouts.conversations, its reduced to the the id and name and a list of usernames of the conversation.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[balloob]

Please open a PR for the docs and ask in description to add milestone 77 to it.

[hobbypunk90]

@balloob what do you mean? There is a pr for the hangouts doc, only the question for milestone 77 is missing.
I only have to add "pls add milestone 77" to description? 😁

[balloob]

I don't see a docs PR linked to this or? It's important you include link in docs PR to this PR and vice versa so they show linked. Makes my life easier

[hobbypunk90]

I don't added it, because I had it in the first pr for hangouts and this pr don't change anything at the doc.
home-assistant/home-assistant.io#6044

[balloob]

Ah, didn't realize the original one wasn't merged yet. ok!