Make structual changes to the reportbuilder

The report builder from Totara is located in a totara directory. This doesn't fit with Moodles directory structure so changes need to be made.

• Use automatic class loading.
• Fix existing classes
• Work out what is commented out and why (git diff ~/git/totara/mod/scorm/rb_sources/rb_source_scorm.php mod/scorm/rb_sources/rb_source_scorm.php)
• Fix warnings
• Remove irrelevant totara data from:
  • main plugin
  • child classes
• Totara_report_manager block needs to be included (or some other way for students and teachers needs to be found to access the reports).
• Move language strings to plugin files
• Fix navigation tree for viewing reports.