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RenderObject debug_name was a char* that sometimes pointed to temporary buffers, change to std::string to ensure proper ownership.

Bug found using ASAN.

std::string can be assigned a const char*, so external code that just
sets the attribute to a null-terminated string should still work
unchanged.

for lineNode

the way freeglut is linked

VS2017

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

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

fixes #18

refs #141

this is not necessary in core profiles since shader based rendering is
used, which does not rely on glColor

Now use GLState to make the call, as the QOpenGLFunctions header undefs
glActiveTexture.

Fixing the include order and separating gl calls from qt calls may also
work here, but not be applicable as this is a template

Specification.

- Fixed RPC call from another thread (Thanks to Matthias Möller for the patch)

Previous version of the code did not call glTextureBuffer in compat contexts.
However glSpec says glTextureBufferARB and glTextureBuffer are aliased, so it can be called as long as extension is available, or context is at least 3.1

changed the isCompatibilityProfile function to also report Qt No profile as compatibility. (required for OSX)