Log Message:
audio/ncspot: update to 0.7.0

Updates to latest librespot, bringing along some larger changes under the hood.

Maintenance:
-Display error when command can not be parsed (#161)
-Add rounding to volume percentage display (#493)
-Log warning instead of panicking on invalid color (#498)
-Update to librespot 0.2.0
	-As part of this, a lot of the Future implementations were migrated to
	async/.await and cleaned up
-Flip play/pause indicators (#511)

Features:
-Add audio_cache_size to set maximum cache size (#429)