CR #327
Merge pull request #327 from tribal-tec/master

Fix context sharing
Merge branch 'master' of https://github.com/Eyescale/Equalizer
Fix #326: Remove Channel::getInput/OutputFrames
Update CHANGES for last commit
Fix context sharing for transfer window
Merge pull request #329 from tribal-tec/master

Fix context sharing for transfer window
Merge pull request #328 from eile/master

Fix #326: Remove Channel::getInput/OutputFrames
Fix readback and assemble frames (#326)
Replace deprecated ICommand funcs, minor cleanups
Qt stubs
First version rendering
Event handling stubs
Move creation of GLWidget to main thread (breaks event handling for now)
Implement event handling, fix makeCurrent() errors
Context creation, init glew!
Win32 build fixes, fullscreen handling, Win32 execution fixes, cleanups
Fix X11 fullscreen
Context sharing
Cleanup Font and WindowSystem