Redirect for Spotify wót kobelobster

This is just a first version for Spotify.

It supports redirecting links from open.spotify.com to your desktop app if they are

* an album
* a playllist
* a podcast
* a user
* an artist
* a song

Currently not supported is:

* Error handling
* Opening links while navigating spotify web ui. Currently requires reload of page

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Licensing

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