Added static constructor "PerspectiveView.ByEyePointAndTarget"
Added static constructor "AxonometricView.ByEyePointAndTarget"
Merge branch 'CrossFade' of https://github.com/Benglin/Dynamo into CrossFade
Fixed migration functions

- Removed migration functions for the nodes which are no longer
supported in ProtoGeometry.dll
- Fixed the bug which causes migration failure when the old node is not
connected to any input