faust: generated uis should be more accurate

[ghost]

if i load a .dsp file, the default generated ui looks like this:

for comparison, here's what it looks like using faust's native gui generator:

is there any way the generated gui could pull from the .dsp ui variables?

[brummer10]

The purpose is that you could rework the generated UI to your like. So switch control types and reorder them, insert frames to group controls, could all be done with direct visual feedback.
I may implement respect for the metadata at some later point to match the expected outcome more direct, but currently it is not possible.