Fixes:
- emsmdb: avoid emissions of PR_MESSAGE_SIZE in fastdownctx streams (this makes PST export possible)
- email_lib: fix a lost space in IMAP BODYSTRUCTURE response
Enhancements:
- mysql_adaptor: add support for nesting mlists in permission checks
- Recognize the IANA Character Set names
utf-16le,utf-16be(and 32) when converting from RFC5322 to MAPI.
Behavioral changes:
- MAPI tables now always offer a valid PR_ROW_TYPE value
- emsmdb: the set of default properties (on blank message objects) has changed to be closer to what EXC2019 does