wip: [stix2 import] Better attack-pattern external references parsing + parsing external galaxies
wip: [stix2 import] Better attack-pattern external references parsing + parsing external galaxies

SteveClement/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP