[GL3+] add support for currentGLContext for macOS #216
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This PR adds support for the parameter 'currentGLContext' on macOS for the GL3+ RS
There are also a couple of minor changes to help with debugging and multi-threaded applications:
I've applied the PR to v2-1 as there are difficulties compiling master on macOS at present. Ideally this change would be present on master and backported to v2-1 and v2-2. It is a pre-requisite for macOS support in the downstream project ignition-gui and ignition-gazebo.