[32] Save, Load and Settings

- Introduced global header which can be included everywhere
- Introduced QSettings
- No longer QApplication inside main.cpp
- Rewrited deleting objects for Save & Load in MainWindow
- Own structure for .qep (project file) and .qem (map file)
- MapTile & MapChunk has cache constructors which are just for now
- Half(?) done on water
- Added NewProject and StartUp classes
- Cleaned TexturePicker from non-needed includes