Changes the default units for guides creation:

• Guide extension: the length (in current units) of the guide tool
• Guide units: the guide subdivision marks (in current units)
• Protractor
  • Radius: the radius (in current units) of the protractor object
  • Angles: at witch angles the marks appear
  • Polar angles: the angle snap for the prolar position gizmo
  • Point mark extension: the size (in current units) of the point mark