[ADD] common methods for import and export synchronizers
[ADD] common methods for import and export synchronizers

anybox/connector,acsone/connector,fevxie/connector,Endika/connector,BT-jmichaud/connector,MindAndGo/connector,js-landoo/connector,guewen/connector,dvitme/connector,sylvain-garancher/connector,BT-fgarbely/connector,esousy/connector,BT-fgarbely/connector,mohamedhagag/connector,guewen/connector,esousy/connector,sylvain-garancher/connector,brain-tec/connector,brain-tec/connector,fevxie/connector,brain-tec/connector,mohamedhagag/connector,dvitme/connector,hugosantosred/connector,gurneyalex/connector,Antiun/connector,BT-ojossen/connector,open-synergy/connector,js-landoo/connector,acsone/connector,gurneyalex/connector,anybox/connector,Antiun/connector,BT-jmichaud/connector,open-synergy/connector,hugosantosred/connector,zhaohuaw/connector,BT-ojossen/connector,maljac/connector,maljac/connector,MindAndGo/connector,acsone/connector,zhaohuaw/connector,Endika/connector