Environment_Engine: Removed SplitPanelByGeometry due to lack of use and confusing UX#3176

FraserGreenroyd merged 3 commits intodevelopBHoM/BHoM_Engine:developfrom

Environment_Engine-#3125-RemovingSplitPanelByGeometryBHoM/BHoM_Engine:Environment_Engine-#3125-RemovingSplitPanelByGeometryCopy head branch name to clipboard