v0.26.0

• all
  • update to OpenCV 4.5.1
• core
  • add Matrix initializers: eye, ones, zeros (#758)
  • add multidimensional mat creation
  • add ndim mat constructor
  • added accumulators
  • added norm call with two mats (#600)
  • keep a reference to a []byte that backs a Mat. (#755)
  • remove guard for DataPtrUint8 since any Mat can be treated an Uint8
  • add Mat IsContinuous() function, and ensure that any Mat data pointers used to create Go slices only apply to continuous Mats
  • fix buffer size for Go strings for 32-bit operating systems
• build
  • bring back codecov.io
• calib3d
  • correctly close mat after test
• dnn
  • add ReadNetFromONNX and ReadNetFromONNXBytes (#760)
  • increase test coverage
• docker
  • dockerfiles for opencv gpu builds
• docs
  • corrected links to CUDA and OpenVINO
  • list all unimplemented functions in photo module
  • replace GoDocs with pkg docs
  • update ROADMAP from recent contributions
• imgproc
  • add test coverage for GetTextSizeWithBaseline()
  • close all Mats even those based on memory slices
  • close Mat to avoid memory leak in ToImage()
  • refactoring of ToImage and ImageToMatXX functions
• openvino
  • fix dldt repo in makefile for openvino
• os
  • adding gcc-c++ package to rpm deps
• photo
  • add SeamlessClone function
• profile
  • add created mats in Split and ForwardLayers to profile (#780)