Pysmartthings

- Remove tests from package
- Correct `gasMeter` capability
- Update CI/CD config

- Update dependencies
- Add constants for `gasMeter`
- Update Install URL

- Make all `device` attributes optional during deserialization

* Add `tvChannel` capability (thanks Alex-Klein)
* Add wrapper methods for media devices (thanks PiotrMachowski)
* Update interpretation of command responses
* Update dependencies

* Black formatting
* Misc changes

- Updated dependencies
- Convert `DeviceType` enum to string with constants `DEVICE_TYPE_OCF`, `DEVICE_TYPE_DTH`, `DEVICE_TYPE_UNKNOWN`, `DEVICE_TYPE_ENDPOINT_APP`, and `DEVICE_TYPE_VIPER`