move tons of prims to prim.etc

for most of these, it's thanks to recent changes in
BreedIdentifierHandler, which doesn't have compile-time dependencies
on prim classes anymore

the remaining few are for other reasons I didn't investigate.
maybe they've been eligible to move for a long time and it just
didn't happen because until recently we didn't have Classycle
in the sbt build to help us
remove a few little bits of HubNet that were missed before