Fix class on active move/copy links
Added move/copy icons, improved edit icon and some icon positions
Added icon for empty trash (#1485775)
Support SMTP socket context options via new config option 'smtp_conn_options'
Fix icon position after listicons.png update
Add 'markfolder' event (#1485775)
Improve wording: don't pretend that mailbox is empty if search/filter doesn't find any messages
Fix special folder icons for folders in one level below the root
Fix empty folder icon for trash folder one level below the root