* use media player defined device classes instead of custom ones, add options flow test, add timeout options parameter
* make options update error more generic
* fix config flow options update logic
* simplify logic for options update during import
* use platform list for load and unload
* update private config flow function name and description
* fix grammar in strings.json
* update mock config variable names to be more accurate
* remove timeout conf option, create device_class property
* update requirements
* update .coveragerc to indicate that config_flow has tests
* fix source of device_class property and move constants to const.py
* fix grammar in error message
* remove redundant device check in async_setup_entry since device connection is checked during config flow
* revert change to async_setup_entry, raise ConfigEntryNotReady if device can't be connected to
* update error text
* add more context to error text
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