wip: [stix2 import] Credential observable import + standard observable parsing function reworked
wip: [stix2 import] Credential observable import + standard observable parsing function reworked

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