Merge pull request #361 from eile/master

Fix crash in eqPly render clients with Qt
Fix fabric::Error usage and implementation
Merge pull request #364 from tribal-tec/master

Fix fabric::Error usage and implementation
Merge pull request #362 from eile/master

Fixes
Enable FBO rendering using QGLWidget
Merge pull request #365 from tribal-tec/master

Enable FBO rendering using QGLWidget
Merge pull request #367 from eile/master

NPR on view
Fix mixup of horizontal and vertical wheel events (OSX and Windows untested)
Merge pull request #368 from tribal-tec/master

Fix mixup of horizontal and vertical wheel events (OSX and Windows untested)