WIP: update LegacyUI for new paradigm

Instead of creating anonymous inner classes for things like status and
toolbars, we could create adapters for the IJ layer.
wip: ActiveImagePlusPreprocessor

Provides a method to harvest ImagePlus @Parameter inputs.
WIP: LegacyCompatibleCommand

It was decided this should be a duck type class that does not extend
ij.Plugin.
WIP: status bar

add adapter status bar
wip: LegacyDialogPrompt
WIP: create toolbar adapter
WIP: create ApplicationFrame adapter
WIP remove IJ1 imports from all but IJ1helper