Support the new batched query results from the mu server; these are much faster to render (2-3x it seems). Rearrange the code a bit to avoid byte-compiler warnings. Obsolete mu4e-header-func, to be replaced by mu4e-headers-append-func.
Split message and metadata, so we can use pristine (possibly pre-cached) messages. Update dependencies.
No longer needed; remove all traces.
Rename mu4e-proc.el into mu4e-server.el Rename mu4e~proc... into mu4e--server... Update users, too.