Remove anything to do with iText or proprietary tech

[rtfarte]

We don't want to be held to any copyright or protected works. We need to remove anything that might get others into trouble by including this library in their projects. I would like the license to be as open as possible, but we need to make sure we can open it up first.

https://github.com/rtfarte/OpenPDF/blob/master/openpdf/src/main/resources/misc_licenses.txt