Add migration script to migrate form aoefootnote extension

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/happy_feet/trunk@83986 735d13b6-9817-0410-8766-e36946ffe9aa
tsk3186 FCE: Content Rendering (sto450)

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/happy_feet/trunk@83990 735d13b6-9817-0410-8766-e36946ffe9aa