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* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* fix typo

* fix typo

* fix typo

* del gf&fa registry (wo reuse pointnet module)

* fix typo

* add benchmark and add copyright header (for DGCNN only)

* fix typo

* fix typo

* fix typo

* fix typo

* fix typo

* support dgcnn