MDL-34397 Move course content cache to MUC 1
MDL-34397 Move course content cache to MUC 2
MDL-34397 Move course content cache to MUC 3
MDL-34397 Move course content cache to MUC 4
MDL-34397 Removing references to course.modinfo
MDL-34397 Do not access deprecated field course.modinfo

rebuild_course_cache() now supports resetting cache for multiple but not all courses
MDL-34397 TODO
MDL-34397 Object section_info calculates expensive data on demand only 1
MDL-34397 Object section_info calculates expensive data on demand only 2
MDL-34397 Object section_info calculates expensive data on demand only 3
MDL-34397 dont write to cm_info properties
MDL-34397 (other issue?) function moveto_module does not modify properties of object
MDL-34397 do not write to cm_info properties
MDL-34397 Properties of cm_info are read-only and calculated on request 2
MDL-34397 Properties of cm_info are read-only and calculated on request 3
MDL-34397 course_modinfo 1
MDL-34397 course_modinfo 2
MDL-34397 course_modinfo 3
MDL-34397 remove  arg from seciton_info as not needed
MDL-34397 course_modinfo 4