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Check whether the OpenGL context matches the one that was requested via settings. If not, print a warning.

hotfix patch for pickingRenderer

Closes OpenFlipper-Free#150

See merge request !91

added vertex and fragment shaders for picking which render vertex

See merge request !92

Feature picking shader compatibility

Closes #18

See merge request !88

colors from input attributes to screen. if the shaderCache would have a
good interface, this would not have been necessary

also removed some obsolete checks for compatibility profiles, which
prevented the proper use of the optimized picking variant when compat
profiles with version 3.2 or newer were present

log noise

spamming when version check fails

glVertexAttribDivisor is a nullpointer. Use ARB extension call instead

OpenFlipper-Free#150
by initializing the colorStack also when the pickCache is used, as the
picking renderer reinitializes the colorstack.

- Updated Stackwalker

See merge request !90

- Log to Crashdump file and console for StackWalker

List plugins with info in about

See merge request !89

also add texturebuffer extension macro for glsl 130
improves compatibility with older contexts

fixes #18

Require QT5.5 as minimal version. All other checks for versions lower than 5.5 removed

See merge request !87

Removed qt4 ifdefs

See merge request !86

refs #141