Radical is a model-view framework. There is a common API to
set data, then view modules to display it. Those modules have
been rewritten on top of new APIs.
Not all features are yet re-integrated, most are. Future commits
will address the various regressions and missing features. This
time, the code should be maintainable. The whole separation of
concerns analysis has been re-done. Allowing code de-duplication
and generalization.
The API remain the same, only `set_menu` has changed a little to
allow merging the 2 sub-menu code paths.
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