While its not as good as acutally checking if the extension is
installed, using TYPO3 API this early often does break

Feature upgrade to typo3 11

See merge request !13

[FEATURE] Add XClass for RecordsContentObject

See merge request !17

TYPO3 CType Shortcut uses the RecordsContentObject, which
will read the elements. Our XClass will only filter after that.

[BUGFIX] $row can be null, which will break any following call

See merge request !16

If for some reason, someone decides to use a group element
for its transOrigPointerFields, we will get a small record array
instad of just the ID. This Change fixes typecasting that to 1