Clean up StaplingExample
Clean up StaplingExample

1. Use 'filename' directly instead of retrieving the name from a
   MeshShape

2. Remove unnecessary output code (YAML and <fstream>)

3. Not using the name of a SceneElement as prefix when naming components

simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim