Remove and update dependencies

[yubiuser]

I used cargo-udeps from here to scan for unused dependencies. Two package were removed num and glob.
With cargo upgrades from here I scanned for upgradable dependencies in the Cagro.toml files. I updated them (and regenerated the Cargo.lock) execept of

librespot-core: /core/Cargo.toml
	base64 matches 0.13.1;	latest is 0.21.0
	quick-xml matches 0.23.1;	latest is 0.28.1
	rsa matches 0.6.1;	latest is 0.8.2
	vergen matches 7.5.1;	latest is 8.1.0

librespot-discovery: /discovery/Cargo.toml
	base64 matches 0.13.1;	latest is 0.21.0

because they require changes to the code beyond my rust knowledge. I tracked them down as far as I could - hopefully someone else can continue here:

• vergen does not have thevergen::Config structure since 8.0 anymore, but uses vergen::EmitBuilder now.
• rsa does not have the hash module anymore since 0.7.0, but uses OIDs
• base64 changed encode* and decode* top level functions to methods of engine since 0.20
• quick-xml failed with a few compiling errors