added encrypted drafts functionality
fixed rendering of rich-text emails (pgp/mime support)
significant performance improvements for encrypting/decrypting
support for hiding quoted text when rendering message
added support for HIDE_ARMOR_META client configuration
pass phrase session length configurable with in_memory_pass_phrase_session_length client configuration
fix unwanted attachment preview for binary attachments
welcome-message endpoint uses new API (internal improvement)
improve handling of invalid recipients when composing message
fixed downloading attachments from empty message
fixed crash when decrypting very large message
fixed crash when going back from Trash folder
drop support for IMAP login
internal improvements