Resolve "style: remove absolute namespace prefix"
Description
Remove systematic absolute namespace prefix for the following libraries:
- std
- boost
- itk
- vtk
- glm
- gdcm
- eigen
- realsense2
- OpenCV
- Qt
- Ogre
Few occurrences remain but are necessary to resolve an ambiguity.
Closes #826 (closed)
How to test it?
Nothing more than building...