Fix Issue 424: scrub xlink:href to ensure it is a local reference only
Fix Issue 424: scrub xlink:href to ensure it is a local reference only

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