Anyctx

[nullchinchilla]

Move to use the experimental anyctx crate.

The main benefit here is that

• we no longer have a growing list of fields in DaemonContext
• these fields no longer have to be global to the whole program

[nullchinchilla]

The code is certainly not optimally laid out for anyctx yet --- many "fields" still have users spread across the files and are not properly encapsulated within the module system --- but it should give an idea of how to use that crate.