Clean up convert cbs to arrow functions
Clean up convert cbs to arrow functions

jonboiser/kolibri,learningequality/kolibri,jonboiser/kolibri,christianmemije/kolibri,benjaoming/kolibri,learningequality/kolibri,indirectlylit/kolibri,benjaoming/kolibri,benjaoming/kolibri,mrpau/kolibri,benjaoming/kolibri,lyw07/kolibri,learningequality/kolibri,jonboiser/kolibri,mrpau/kolibri,christianmemije/kolibri,mrpau/kolibri,lyw07/kolibri,indirectlylit/kolibri,mrpau/kolibri,DXCanas/kolibri,lyw07/kolibri,learningequality/kolibri,lyw07/kolibri,christianmemije/kolibri,DXCanas/kolibri,DXCanas/kolibri,indirectlylit/kolibri,christianmemije/kolibri,indirectlylit/kolibri,DXCanas/kolibri,jonboiser/kolibri