XMLQtInterface::insertStyleFileDefinition

clang-tidy modernize-use-default-member-init check

1. Changed urls to https which fixed the following error:

xsd/OpenGeoSysGLI.xsd, at line 1, column 66: Document is not a XML schema.
Error XSDError in ..., at line 3, column 194: Loaded schema file is invalid.

If this error ever pops up again try to cut the internet connection! No joke!

2. Local schema files are now copied to bin-directory during CMake configuration and package generatiion (install step).

Clang format run on near-the-header lines.

Happy New Year

This potentially saves a second copy compared to using const
reference. See Effective Modern C++, Item 41.

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

This should fix some issues when hashfiles contain newline characters.

- Also the xml file is read only once
- XMLQtInterface is now responsible for reading and validating the file
  (see XMLQtInterface::readFile())
- Added QByteArray XMLQtInterface::_fileData for caching the file

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