[refactorLayers] Finished the basic dragBoxLayer refactor
[refactorLayers] Finished the basic dragBoxLayer refactor

jacqt/plottable,alyssaq/plottable,alyssaq/plottable,palantir/plottable,RobertoMalatesta/plottable,NextTuesday/plottable,iobeam/plottable,danmane/plottable,palantir/plottable,danmane/plottable,softwords/plottable,softwords/plottable,NextTuesday/plottable,NextTuesday/plottable,jacqt/plottable,danmane/plottable,RobertoMalatesta/plottable,iobeam/plottable,iobeam/plottable,palantir/plottable,alyssaq/plottable,softwords/plottable,RobertoMalatesta/plottable,palantir/plottable,jacqt/plottable