Hey! I started work on this a few weeks ago for a hobby project (video); the upgrade work is by no means complete yet, but wanted to link it here in case it's helpful to someone as a reference for a cleaner PR.

Current status: it works, but:

• it panic whenever you try to quit with Ctrl C (this is probably easy to fix, I just haven't done it yet)
• dbus is a bit complicated. The dbus libraries changed significantly as part of supporting tokio 1.0, which is required for librespot v0.2.0. I'd wanted to rework the current dbus_mpris implementation anyway -- would be nice to support property change signals, and to not hit the Spotify API on every dbus property fetch -- so I've been doing it in the same branch so that I can use dbus_crossroads, which seems to be the "newer" way of implementing a DBUS server.
• I've ignored automated tests so far.

Code is here: master...capnfabs:fabian/wip-big-upgrade

Would you be open to reworking DBUS and doing the upgrade in the same PR? I would normally try and do the minimal possible upgrade in a PR, but am very much not doing this in the code on that branch.

Cleaned up that branch a bit, fixed the Ctrl C issue, and pushed it to #977

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