Added symbol as an element that is referred to when uniquifying elements, added a TODO for connectors/markers
Added symbol as an element that is referred to when uniquifying elements, added a TODO for connectors/markers

trentmillar/ddp-level-editor,ryanramage/svg-editor,ryanramage/svg-editor,trentmillar/ddp-level-editor,trentmillar/ddp-level-editor,ryanramage/svg-editor