Fixes #7682. 'Input textarea auto height' - Improve detection single/multiple lines, improve doc, enhance unit tests.

Fixes #1201. FE.parameter option has never been implemented. According https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex only the values '0' and '-1' are good. 'tabindex' has been removed from Manual.rst. FormEditor.sql has been changed that all links are 'tabindex="-1"'.

Implement workaround: set expire timestamp always one second to earlier. A relock will always see an expired lock. This might be dangerous for exactly one second.

API change in T3 makes QFQ incompatible with Typo3 >=9.4. Change compatibility back to <9.3. Problem: sys_language_uid

Fixes #8853. fe.class=action: container should be hidden - hidden is wrong - FE-action might be assigned to templateGroup Container. New solution: if FE.class='action' only templateGroups are in the 'container' list.

Revert "Refs #8853. fe.class=action: container should be hidden - FormEditor now hides the container dropdown in case of 'action' elements."

This reverts commit 113bb2eb

Refs #8853. fe.class=action: container should be hidden - FormEditor now hides the container dropdown in case of 'action' elements.