Fixes:
- imap: reduce memory footprint when FETCHing messages
- imap: resolve shutdown ordering crash
- exmdb: upgrade 0-length PR_ENTRYIDs to fake 1 byte to soothe Outlook Cached Mode syncer
- ews: heed MAPI proptype semantics and interpret 0xffffffff as a signed int when serializing to XML (-1 rather than 4294967295)
- gab: resolve out-of-bounds access in dntomid
Enhancements:
- oxm2mt: support embedded messages
- oxm2mt: add option to extract just an attachment embedded message
- eml2mt: add option to extract just an attachment embedded message
- mysql_adaptor: add TLS connection config directives
Behavioral changes:
- exmdb: launch threads in more rapid succession when there is job queue contention