This is just the packet framework for the Scribe button on recipe books
and the Cast Spell button on books that allow casting spells on
targets. It will need to be hooked up to a content implementation
This adds the `dz_switch_id` field to doors and dynamic_zones. It will
allow for compasses to be automatically added to dz entrances and will
support moving clients to the dz on use without needing to script it.
These can be imported for switches/doors from live packet dumps.
Also removes compass packet encoders (same struct in all clients)
