Move non-core typings into theories/typing/lib

_CoqProject

theories/typing/lib/cell.v

theories/typing/lib/fake_shared_box.v

theories/typing/lib/option.v

theories/typing/lib/refcell/ref.v

theories/typing/lib/refcell/ref_code.v

theories/typing/lib/refcell/refcell.v

theories/typing/lib/refcell/refcell_code.v

theories/typing/lib/refcell/refmut.v

theories/typing/lib/refcell/refmut_code.v

theories/typing/lib/rwlock/rwlock.v

theories/typing/lib/rwlock/rwlock_code.v

theories/typing/lib/rwlock/rwlockreadguard.v

theories/typing/lib/rwlock/rwlockreadguard_code.v

theories/typing/lib/rwlock/rwlockwriteguard.v

theories/typing/lib/rwlock/rwlockwriteguard_code.v

theories/typing/lib/spawn.v