Merge branch 'devel'

.gitlab-ci.yml

CMakeLists.txt

README.md

blender/urdf_to_blender.py

cmake

cmake-modules/gepetto-viewer-corba-plugin.cmake

doc/CMakeLists.txt

doc/Doxyfile.extra.in

doc/cmake.dox

doc/layout.xml

doc/main.hh

examples/basic-scene.cc

examples/display-urdf.cc

examples/pyplugin/matplotlib_example_deprecated.py

examples/pyplugin/pythonwidget.py

examples/pyplugin/qcustomplot_example_1.py

examples/pyplugin/qcustomplot_example_2.py

idl/gepetto/viewer/graphical-interface.idl

include/gepetto/gui/dialog/pluginmanagerdialog.hh

include/gepetto/gui/doc.hh