- _renderQA() has moved to template.py:render_card()
- dropped QAData in favour of a properly typed dict
- render_card() returns a TemplateRenderOutput struct instead of a dict
- card_did_render now takes that output as the first arg, and can
mutate it
- TemplateRenderContext now stores the original card, so it can return
a card even in the add screen case
The old mungeFields and mungeQA hook have been removed as part of this
change. mungeQA can be replaced with the card_did_render hook.
In the mungeFields case, please switch to using field_filter instead.
This allows us to add a docstring to .append() so users can see
the names of the arguments that are being passed, and means we
don't have to remember to prepend run_ when calling a hook.
