Andrew Nicols 44a4e78075 MDL-74112 course: Support multiple mforms in format chooser
The format chooser JS assumes that it is the only mform on the page. If
it is not, and another mform appears before it, then the jump will not
work.

This change:
* updates the formatchooser to modern JS
* allows multiple forms to exist on the page
* stops using id fields
* always hide the format selection button
2022-03-17 11:11:53 +08:00
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