Several new functions added, created material.py for hfss material manipulation

Functions added
```
desktop.py
  save_as_project(oDesktop, filename,overwrite=True)
modeler3d.py
 create_box(create_box( oEditor, xpos, ypos,  zpos,  xsize, ysize, zsize, params) - with polishing by mradway
design.py
 solve(oDesign,setup_name_list)
created material.py
 does_material_exist(oProject,material_name) 
 add_material(oDesktop, material_name, params)
hycohanx.py
 added line import to hycohanz.material
```