This commit covers all events outside of /mod/. It adds mapping info for restoring
events, or the default implementation which returns false if mapping is not required.
blog_entry_created - Removed summary field
blog_entry_deleted - Removed summary field and unwanted entry record
blog_entry_updated - Fixed single quotes and removed summary field
course_module_created - Removed subject
course_module_updated - Removed subject
user_deleted - Removed user firstname and last name
course_module_viewed - Fixed description