port the most basic suzanne xml3d example to dev2. sceneparser was already ported earlier, this is just the entry point for the standalone example, following how physics2 was created as a new entrypoint previously. NOTE: free cam does not work here yet, to be improved (possibly the cam from xml3d decl is activated but that one doesn't have controls)
Merge pull request #67 from playsign/dev2xml3d

port the most basic suzanne xml3d example to dev2. sceneparser was already ported earlier