Remove unused LinkableHeaterCoolerFront, see https://github.com/phetsims/energy-forms-and-changes/issues/60
Remove unused LinkableHeaterCoolerFront, see https://github.com/phetsims/energy-forms-and-changes/issues/60

phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes