Move executables to Applications folder

- Moved Data Explorer
  - Cleaned up some Data Explorer stuff
- Moved Utils
- Moved ProjectData to `Appications/ApplicationsLib`

@rinkk Shall we rename `ogs-gui.exe` to `DataExplorer.exe` as well?
I would prefer this INCLUDE_DIRS being removed and specify full path in the ProjectData.h for the GEOModels.h.