MDL-32508 course/formats: Respect single page course display mode

MDL-32508 course/formats: Respect single page course display mode

Topics and weeks have been converted to use a shared renderer to output
their content.

Note, I started with good intentions but this renderer has mixed
paradgims due to fast and cheap winning out on the trinity.

AMOS BEGIN
   MOV [currenttopic,access],[currentsection,format_topics]
   MOV [currentweek,access],[currentsection,format_weeks]
AMOS END