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this probably breaks compatibility to undocumented writings like
--b --batch /batch etc.

initialize settings before parsing command line options.
prevent double initialization.

afterwards to prevent setting the default SurfaceFormat multiple times

calls during initialization of the Widget, or at least avoid a segfault
when calling opengl functions in makeCurrent

fixes errors with all unittests of OF

newer.

attach console earlier on windows so the console output and commandline parameters work as intended.

Added width specifier to format.

check Qt Version when command line arguments are parsed and disable stereo for qt version 5.7.0 and 5.7.1

changed the check for debug console to check if NDEBUG is not defined as
it is the standard behaviour

onec created on windows.

renamed attachExistingConsole function to describe more accurate what it
does.

still kept the debugconsole code as it might be desired to always create a
new console for debug purposes.

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.

* added missing ifdef
* added ifdef for init functions as apple needs no gl loader
* include qgl instead of glloadgen header on apple systems

compilation on Apple works, however there is a segfault which needs further investigation.

* use glLoadGen headers and initialize function instead of glew
* removed glew from ACG cmakelists