Unstable

Synchronizes latest changes from unstable branch into master c.f. commit history changes from 2018 are

• Fix for Debugcontext creation
• fix for missing stderr output

please compile OF with these changes first.

added 1 commit

• 9449c61d - only recreate the Context on Windows OS, as linux and OSX keep the debug

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added 1 commit

• c80f736f - hotfix: set QOpenGLDebugLogger to synchronous mode to enable stacktraces

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mentioned in commit bdcfdd8e

merged