* Register CumSum operator in onnx importer

* Missing whitespace

* Update CMakeLists.txt

* ONNX importer - CumSum op init

* Simple CumSum onnx model

* ONNX CumSum model simple test

* Default axis

* Axis input test

* Inputs variable

* Style apply

* Test 3d exclusive reverse

* Apply style

* Add memory header and std namespace

* Add model_cum_sum tests to plsidml unit_test.manifest

* Add model_cum_sum tests to plaidml unit_test.manifest

* Changed default axis type

* Test model update

* Style apply

* Add test for dynamic axis input