Added LCC-8 package based on Analog Devices LTC6655 datasheet

• A screenshot of the model(s) aligned with KiCad footprint(s)
  • See kicad-footprints!3405 (merged)
• Source files are contributed on the apropriate location
  • See kicad-packages3D-source!394 (merged)
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
  • Seems to be OK, according to display in footprint editor and screenshots in kicad-footprints!3405 (merged)
• WRL model uses correct material properties
  • Material colors set in FreeCAD. Colors of WRL file display correctly when added to footprint. No other separate check or WRL file performed.
• Geometry check performed on the model
  • I don't know what to do for this TODO list item.