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function to prevent the push calls being made without a valid context or
a different context than the pop calls.

QOpenGLWidget.

fixes #2

fixes #118

newer.

DrawModes constructor is now explicit which causes some changes:
e.g. if you used ACG::SceneGraph::DrawModes::TEXCOORD_PER_VERTEX
you now have to use
ACG::SceneGraph::DrawModes::DrawMode(ACG::SceneGraph::DrawModes::TEXCOORD_PER_VERTEX)

closes #52

This reverts merge request !92

As the new glLoad is not compatible with Qt 5.6 we will continue using
glew for now.

This reverts commit 22938119ac1bcf60ad49078c7fa436856bc7c902, reversing
changes made to ed8a9a65a94b8d72b80133d37ddbf4a8c029988a.