Add a model text node with a test.
Isolation working on view nodes.
Cropping of views to elements is now working.
Work on closing out MagnetoOLD-357

Axonometric view node now supports isolation of elements in view and crop-boxing. The perspective view node has been disabled until such time as the API team can give me an explanation as to how the perpective camera model works.
Merge branch 'master' of github.com:ikeough/Dynamo