Split Cliff FCR7350x connectors to allow 3D model for each colour

I have split the Cliff FCR7350x connector into 6 different footprints with their appropriate product number and associated individual 3D model with them to account for the different colours.

I updated the 3D model link along with changing the ${KICAD6_3DMODEL_DIR} parameter over to ${KICAD7_3DMODEL_DIR} and the footprint name and labels. I did not touch the footprint itself, because it works well.

The new 3D model can be found over here: kicad-packages3D!946 (merged)

Edit 2023-01-15: Set reference designators to 'Keep upright' to please the CI