better register display

option 1: make the current register display in ui_processed be double-columned, so we can increase vertical density
option 2: make the register display just a free-form text box we manually layout (cf selection ergonomics #4)
option 3: put them nested under frames in the stackwalk
option 4: same as option 3, but make it collapsable?

I'm inclined to 1 or 2, but 3/4 has precedent in minidump-stackwalk --human

In principle this UX question also extends to any future attempts to expose recovered function arguments.

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