Eventhandling: Wait for command to finish before triggering next
Eventhandling: Wait for command to finish before triggering next

Should solve #733

Jaesin/OctoPrint,Salandora/OctoPrint,foosel/OctoPrint,bicephale/OctoPrint,Jaesin/OctoPrint,beeverycreative/BEEweb,beeverycreative/BEEweb,JackGavin13/octoprint-test-not-finished,bicephale/OctoPrint,JackGavin13/octoprint-test-not-finished,bicephale/OctoPrint,JackGavin13/octoprint-test-not-finished,Jaesin/OctoPrint,Salandora/OctoPrint,foosel/OctoPrint,Salandora/OctoPrint,Salandora/OctoPrint,Jaesin/OctoPrint,foosel/OctoPrint,beeverycreative/BEEweb,bicephale/OctoPrint,foosel/OctoPrint,beeverycreative/BEEweb,JackGavin13/octoprint-test-not-finished