Add a Hook to add Sub Categories to the Constant Editor
Currently the Sub Categories of the Constant Editor are hardcoded (Enable Features, Dimensions, etc).
Especially when you develop a flexible TypoScript Library which should be configurable with the Constant Editor it would be great if you could add custom Sub Categories.
I added a constructor to t3lib_tsparser_ext, which can also be used for other hooks or initialization stuff. Currently it only includes my Hook (callUserFunction) to add Sub Categories.
(issue imported from #M13510)