MDL-46783 permissions: let some moodle/ caps be overriden in all mods
The capabilities changed ('contextlevel' => CONTEXT_COURSE changed to 'contextlevel' => CONTEXT_MODULE) are: * moodle/site:accessallgroups * moodle/site:viewfullnames * moodle/site:trustcontent * moodle/site:viewuseridentity This list came from reviewing the _get_extra_capabilities functions in all core activities. They were all somewhat inconsistent, but I think it makes sense that these capabilities are consistently overridable in all activities. E.g. moodle/site:accessallgroups affects conditional availability even if there is no other user of groups, and moodle/site:viewuseridentity and moodle/site:viewfullnames affect the logs report, if nothing else. As a result of this, several _get_extra_capabilities functions are no longer needed, and all the rest have been simplified.