Added USON-6_1x1.45mm_P0.5mm 3D packages to Package_SON
USON-6_1x1.45mm_P0.5mm.wrl and USON-6_1x1.45mm_P0.5mm.step models for the Texas_USON-6_1x1.45mm_P0.5mm_SMD footprint (Package_SON).
Generated with kicad's packages3D generator script. See merge request 124.
