expose fewer internals in packages, for easier software reuse

- prometheus is now behind an interface, they aren't dependencies for the
  reusable components anymore.
- some dependencies have been inverted: instead of packages importing a main
  package to get configuration, the main package now sets configuration in
  these packages. that means fewer internals are pulled in.
- some functions now have new parameters for values that were retrieved from
  package "mox-".

moxvar/pedantic.go

@@ -1,4 +0,0 @@
-package moxvar
-
-// Pendantic mode, in moxvar to prevent cyclic imports.
-var Pedantic bool