port to prop-level wand

theories/lang/heap.v

theories/lang/lifting.v

theories/lang/proofmode.v

theories/lifetime/at_borrow.v

theories/lifetime/lifetime_sig.v

theories/lifetime/model/primitive.v

theories/typing/fixpoint.v

theories/typing/lft_contexts.v

theories/typing/lib/arc.v

theories/typing/lib/mutex/mutexguard.v

theories/typing/programs.v

theories/typing/sum.v

theories/typing/type.v

theories/typing/type_context.v