Soft-deprecate `<permissions>` and `<options>` in eventListener.xml

[TimWolla]

Having these checks within the XML file makes it very non-obvious that they are happening, because the checking logic is detached from the actual event listener logic. Any checks should be explicitly placed within the PHP file to be self contained and to benefit from IDE support (in case of the options).

These fields should be soft-deprecated / discouraged, e.g. by removing them from the devtools PIP GUI.