Add 3D models to footprint definition

[ceoloide]

Add optional 3D models to the footprint (perhaps reusing Scotto's ones)

[Grazfather]

#10 and #11 added these for Choc v1/v2

[hyperpuncher]

#29 added model options for power switch, nice!nano and keycaps to all switches

[peterjc]

Would adding the parameters:

    keycap_3dmodel_filename: '',
    keycap_3dmodel_xyz_offset: [0, 0, 0],
    keycap_3dmodel_xyz_rotation: [0, 0, 0],
    keycap_3dmodel_xyz_scale: [1, 1, 1],

to all the remaining footprints be reasonable, even if there isn't a 3D model yet?

e.g. I might try using the Nice!Nano model as a substitute for visualizing the Supermini NRF52840.

[peterjc]

It looks like the original https://github.com/infused-kim/kb_ergogen_fp/blob/main/conn_molex_pico_ezmate_1x02.js has been updated with 3D models, so the forked version here could use those too: https://github.com/ceoloide/ergogen-footprints/blob/main/battery_connector_molex_pico_ezmate_1x02.js