[FEATURE] Allow embedding images in emails (resolves #46215)

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/formhandler/trunk@85359 735d13b6-9817-0410-8766-e36946ffe9aa
[TASK] Update TCPDF to the latest version 6.0.080

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/formhandler/trunk@85360 735d13b6-9817-0410-8766-e36946ffe9aa