Revert "Issue https://github.com/OpenACalendar/OpenACalendar-Web-Core/issues/110 - library"

This reverts commit d8fabd38e5281d49cf4ee3ba6bc734fff8db74e3.
New lib
Issue https://github.com/OpenACalendar/OpenACalendar-Web-Core/issues/110 - use new lib