MDL-41101 mod_assign: replaced 'view submission' add_to_log call with an event
MDL-41101 mod_assign: replaced 'view feedback' add_to_log call with an event
MDL-41101 mod_assign: replaced 'view grading form' add_to_log call with an event
MDL-41101 mod_assign: replaced 'view submission grading table' add_to_log call with an event
MDL-41101 mod_assign: replaced 'view submit assignment form' add_to_log call with an event