- moved grid-helper to sub directory
-removed unused drag & drop element
- added fxaa pass custom element and its shader
- adjusted / tinkering with the outline shader settings &
related items
- updated various post process elements:
 * correct handling of window's resize handler where needed
 * added "type" attribute to edgedetect-pass element so that the
type of edge detect shader/algorithm in use can be changed
 * added required shaders for the above
 * various cleanup and adjustements
- experimenting with post processing to add outlines of objects
using shaders etc
 * added custom element fx imports
- various cleanups for shape exports (single selected item vs all scene)
- various tweaks all around