Move parts from FileIO to GeoLib/IO and BaseLib/IO.

Adding a callback for adding project meshes and pass additional arguments to
XmlGspInterface constructor.

Also remove unused includes.

- moved ProjectData.* to Applications/ApplicationsLib
- removed Vrpn folder in DataExplorer

Also update gui for moved ProjectData.

Most of them are not needed anyway but GEOObjects.h.
ProjectData is needed in single place only.

http://www.viva64.com/en/d/0303/print/

These references are now hardcoded in the class constructors of the
XML-IO classes. Also the definition of the two search paths in
BaseLib::FileFinder from the main window are now moved into the
constructor of FileFinder.

XML schema files are first searched (for validation) by their path
and then by the reference in the XML file itself.

This reverts commit 05677165.

Conflicts:
	FileIO/XmlIO/XmlGspInterface.cpp
	README.md

added XmlIO; added FemEnums + Info-objects; added ProjectData; currently compile errors due to changes in PointVec