Add 3D Gizmo control model

Add:

1. Auto-flip face normal, Only to the whole mesh.
2. Show the part of mesh on the ground.
3. Add coordinate indication
4. Add move, rotate, scale gizmo control

Fix:

1. Fix color not changed when Change the group after splited.
2. The saved stl file it's model moved if you add support then move the model.
3. *.Photons file preview image doesnot display on machine.
4. When you open a mesh file, rotate the model then scale will be wrong .

Modify:

1. Change model interior color.
2. Change machine xsize and ysize to valid print size
3. The window default display size
4. You can rotate the view with any angle.