This avoids clang error in release mode: atom not found in symbolIndex(__ZN7EmberNs11EmberReport23StaticErrorReportStringERKNSt3__16vectorINS1_12basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEENS6_IS8_EEEE) for architecture x86_64
Derive from QOpenGLWidget instead of QGLWidget. More commits to follow.