Merge remote-tracking branch 'upstream/master'
Free explicitly allocated capability data
Explicitly deallocate client identity
Merge pull request #444 from CodaFi/fix-leaks

Fix leaks.
Added UID Search All Expression and SearchKind
Merge pull request #448 from Metric/searchexpressions

Added UID Search All Expression and SearchKindAll for IMAP
Added missing file: fixed #438
Added qq.com mail provider settings
Added open mailbox.org mail provider settings
Added MCOIMAPCapabilityGMail
Merge pull request #451 from CleanShavenApps/mc-master

Added settings for qq.com and openmailbox.org
Implemented disconnection operation: fixed #412
Changed the comment
Fixed #454: fixed parsing of headers
Fixed #260: added ability to render a message without stripping spaces
Fixed cmake build
Fixed missing enum
Support searching by a gmail thread id
Support searching by a gmail thread id
Tabs -> Spaces