Improve version sensor

[tjorim]

Description:

This PR builds on the updated version sensor (#18067). It improves validation and adds a name that makes sense with the new functionality.

Currently it always shows 'Current Version' as name, which is confusing when using the component to check the latest version available.

I think this is not a breaking change, but maybe someone can verify (@ludeeus reminded me the entity_id is linked to the name):

• If a user specified a custom name before it still uses that one
• If a user is not using the new functionality it still has the same default value

Edit: this now also sets the icon property which was forgotten

Related issue (if applicable): fixes # NA

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#7409

should be cherry-picked for the beta 0.82 release

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

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

• Documentation added/updated in home-assistant.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.

[fabaff]

Thanks 🐦

[fabaff]

Can be merged if CI passes.

[tjorim]

It's fixed now, Travis hasn't started here yet but succeeded on my personal repo.