Typing, linting, cleanup

[C0rn3j]

Fixes made while attempting to deal with #1244

is prefs.cache_list unused and safe to be removed?
it looks to be called once from a module to init a cache list, and loaded from save[170], but it is never set.

• Make spot_ctl and tidal always belong to Tauon class instead of duping them globally too, this enables us to set them directly without having to check for None types
  • The code (both pre and post PR) looks as if Tidal is a hard dependency, was this intended, or am I reading it wrong?
• Remove want_reconnect in phazor - it did nothing.
• Start using stdbool.h in phazor and convert relevant ints to bool.
• Make phazor require C17 at minimum(2018), and prep for requiring C23 - which just came out in 2024-10 so best give it some time - that one adds nice features like... bool