Update webhook to send colours used by Plexamp

Plexamp uses BlurHash for the colours.

You can query the server for the BlurHash value for the colours.

http://IP-ADDRESS:32400/library/metadata/<ratingKey>?includeFields=thumbBlurHash,artBlurHash&X-Plex-Token=<YOUR_TOKEN>

Which will return something like

thumbBlurHash="TLCOIA=xs+}ts,S1EMI;Ne10I@j]"
artBlurHash="LmH]n4^MoIb0}pxWSNR+sRWXWrWV"

Then you decode it into the colours using the BlurHash library.

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