Expose num

[neworderofjamie]

Implementing EventProp, I got annoyed enough to implement #553. As well as improving usability, with large models where multiple synapse/neuron groups are actually getting merged together, this will improve performance as otherwise the "special function" unit on GPUs can get saturated by float->int conversions

Fixes #553

[tnowotny]

Also looks good - not too many surprises here either.

[codecov]

Codecov Report

Patch coverage: 97.95% and project coverage change: +0.06 🎉

Comparison is base (c578132) 88.85% compared to head (0c9c110) 88.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
+ Coverage   88.85%   88.92%   +0.06%     
==========================================
  Files          76       76              
  Lines       12374    12393      +19     
==========================================
+ Hits        10995    11020      +25     
+ Misses       1379     1373       -6     

Impacted Files	Coverage Δ
src/genn/genn/code_generator/initGroupMerged.cc	93.75% <95.65%> (+0.07%)	⬆️
...enn/genn/code_generator/customUpdateGroupMerged.cc	90.29% <100.00%> (+0.39%)	⬆️
src/genn/genn/code_generator/groupMerged.cc	86.94% <100.00%> (ø)
...enn/genn/code_generator/neuronUpdateGroupMerged.cc	93.18% <100.00%> (+0.03%)	⬆️
...nn/genn/code_generator/synapseUpdateGroupMerged.cc	96.00% <100.00%> (+0.06%)	⬆️

... and 2 files with indirect coverage changes

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