Use confluence help for context help also when using help course

When configuring the legacy help course provider for help, the context help is disabled as we can not support this using the course help. However, this creates null-pointer in some cases, eg. when instantiating the movie player plugin.

HFU uses the course help, but actually only for the greater manual, meaning the main help link. For context help it is desired to use the direct jump in links from the confluence manual.

The goal of this issue is to extend the legacy course help system to use the new confluence help system to display the context help and use the course help only when clicking the main help link it the top navigation