First OGS simulation main program.
[A] Remove QtXml dependency and linking to qt/vtk.
[A] Include copyright and version info.
[A] Make project file argument unlabeled.

This is not an optional argument and the extra flag is not necessary.
Specify arguments help info.
[T] Add EmptyProject ctest for ogs executable.
[T] Update test for ogs application.

Removing old files; Add current format project.
[A] Application reads project file in structures.

A new set of boundary conditions, fields, processes is provided.
[A] Replace local config read with ProjectData.
Added path to includes.
[PL] Using new interface for searching geometry.
[A] Remove git hash from message. Adjust (c) year.
[A] Move Tests.cmake into CLI/. Cleanup cmake file.

The Tests of the CLI/ogs should stay together with the binary.
[PL] Add mesh subset to initialize().
[PL] Initialize MeshSubsets and MeshComponentMap.
[PL] Rename mesh_items_all_nodes; items->subset.
[PL] Add destructor for GroundwaterFlowProcess.
[PL] Move mesh_component_map to class variables.

...from the initialize().
Also delete it in the dtor.
[PL] Add createDofMap() in Process.
[PL] Use number of node's DOF in createDOFMap().
[PL] Remove MeshComponentMap include from GW.