Add TYPO3 12 compatibility;  Improve mail wizard: show html and plain text preview in settings step; UI Improvements; Make wizard settings step configurable by user tsconfig; Restore open tab in settings step after edit properties; Add plain text link tracking (only if html part exists); Add delete mail buttons to report module; Add several event dispatcher (mail header, csv import,  scheduled sending start/finish); Change way to include autoloader class from phar;  [BREAKING] Change user tsconfig parameter hideManualSending to hideManualSendingButton; [BREAKING] Do not show hidden pages in mail wizards source selection;