Reordered XBlock class methods
Reordered XBlock class methods

mitodl/edx-sga,mitodl/edx-sga,eduNEXT/edx-sga,eduNEXT/edx-sga,mitodl/edx-sga,Lektorium-LLC/edx-sga,Lektorium-LLC/edx-sga,Lektorium-LLC/edx-sga,Lektorium-LLC/edx-sga,eduNEXT/edx-sga,mitodl/edx-sga,eduNEXT/edx-sga,Lektorium-LLC/edx-sga,eduNEXT/edx-sga,mitodl/edx-sga