* Add select source support
* Review feedback changes
* Removed unused import
* Ignore 'umused' import used in typing
* Only include trace back on useful errors
* Remove return from play_source
## Description:
Denon HEOS media player.
**Pull request in [home-assistant.io](https://github.com/home-assistant/home-assistant.io) with documentation (if applicable):** home-assistant/home-assistant.io#8848
## Example entry for `configuration.yaml` (if applicable):
```yaml
heos:
host: HEOS-1
```
## Checklist:
- [X] The code change is tested and works locally.
- [X] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**
- [X] There is no commented out code in this PR.
If user exposed functionality or configuration variables are added/changed:
- [X] Documentation added/updated in [home-assistant.io](https://github.com/home-assistant/home-assistant.io)
If the code communicates with devices, web services, or third-party tools:
- [X] New dependencies have been added to the `REQUIREMENTS` variable ([example][ex-requir]).
- [X] New dependencies are only imported inside functions that use them ([example][ex-import]).
- [X] New or updated dependencies have been added to `requirements_all.txt` by running `script/gen_requirements_all.py`.
- [X] 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.
[ex-requir]: https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/keyboard/__init__.py#L14
[ex-import]: https://github.com/home-assistant/home-assistant/blob/dev/homeassistant/components/keyboard/__init__.py#L23
Co-authored-by: Andrew Sayre <6730289+andrewsayre@users.noreply.github.com>
cgtobi
Andrew Sayre
Andreas Rydbrink