Merge changes I6202bcbd,I1bf133fb,If364a0da,I4d753287,I28ba0b4d, ... into qt-dev

* changes:
  Add ROI_ALIGN, ROI_POOLING, and HEATMAP_MAX_KEYPOINT signatures.
  Define all 1.2 reshape ops in operation manager.
  Define all slicing ops in operation manager.
  Define all reduce ops in operation manager.
  Define all resize ops in operation manager.
  Define all reshape ops in operation manager.
  Define all pooling ops in operation manager.
  Define all normalization ops in operation manager.
  Define GATHER, SELECT, TOPK in operation manager.
  Define all lookup ops in operation manager.
  Define all casting ops in operation manager.
  Add fully connected op in operation manager.
  Define all elementwise ops in operation manager.
  Define concat and split op in operation manager.
  Define all comparison ops in operation manager.
  Define all arithmetic and logical broadcast ops.
  Add ADD, MUL, SUB, DIV to operation manager.
  Define all convolution ops in operation manager.
  Reorganize OperationManager in random graph generator.
  Random Graph Generator