genn-team/genn: GeNN 3.1.0 RC

<p>This release builds on the changes made in 3.0.0 to further streamline the process of building models with GeNN and includes several bug fixes for certain system configurations.</p> User Side Changes <ul> <li>Support for simulating models described using the <a href="http://spineml.github.io/">SpineML</a> model description language with GeNN.</li> <li>Neuron models can now sample from uniform, normal, exponential or log-normal distributions - these calls are translated to <a href="http://docs.nvidia.com/cuda/curand/index.html">cuRAND</a> when run on GPUs and calls to the C++11 <random> library when run on CPU. <ul> <li>Model state variables can now be initialised using small snippets of code run either on GPU or CPU. This can save significant amounts of initialisation time for large models. </li> <li>New <a href="https://docs.microsoft.com/en-us/visualstudio/msbuild/msbuild-reference">MSBuild</a> build system for Windows - makes developing user code from within Visual Studio much more streamlined. </li> </ul> </li> </ul> Bug fixes: <ul> <li>Workaround for <a href="https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1663280">bug</a> found in Glibc 2.23 and 2.24 which causes poor performance on some 64-bit Linux systems (namely on Ubuntu 16.04 LTS).</li> <li>Fixed bug encountered when using extra global variables in weight updates.</li> </ul&gt