[epsonprojector] Add retrieval of source list #18006
Merged
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Newer Epson projectors have a command (SOURCELIST?) that retrieves a list of available input sources (code and description) for the device. This PR adds the ability to retrieve the source list and if retrieval is successful the source list is loaded as the state options for the source channel. If the retrieval of the source list is unsuccessful or the loadSourceList configuration option is set to false, the predefined list of source options will be used instead. Three additional options were also added to the predefined list.