Mac debugging with LLDB

[neworderofjamie]

While investigating #517, I wanted to use the debugger but no one had been tempted by the "good first issue" to fix #57. I now have and GeNN users on the Mac can now debug code generator bugs to their heart's content :D (this also must win some sort of "oldest bug fixed" prize as it was first raised in 2015!)

Fixes #57

[codecov]

Codecov Report

Merging #518 (d411dd9) into master (a53cbca) will decrease coverage by 7.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #518      +/-   ##
==========================================
- Coverage   86.77%   79.70%   -7.08%     
==========================================
  Files          84       79       -5     
  Lines       18081    14145    -3936     
==========================================
- Hits        15690    11274    -4416     
- Misses       2391     2871     +480     

Impacted Files	Coverage Δ
src/genn/genn/code_generator/codeStream.cc	44.00% <0.00%> (-48.00%)	⬇️
include/genn/genn/logging.h	0.00% <0.00%> (-44.45%)	⬇️
include/genn/genn/code_generator/codeGenUtils.h	62.85% <0.00%> (-37.15%)	⬇️
...nn/genn/code_generator/synapseUpdateGroupMerged.cc	62.50% <0.00%> (-34.85%)	⬇️
src/genn/genn/code_generator/backendBase.cc	57.92% <0.00%> (-34.15%)	⬇️
...enn/genn/code_generator/neuronUpdateGroupMerged.cc	65.71% <0.00%> (-29.58%)	⬇️
src/genn/genn/code_generator/modelSpecMerged.cc	67.45% <0.00%> (-28.07%)	⬇️
src/genn/genn/code_generator/initGroupMerged.cc	70.83% <0.00%> (-24.31%)	⬇️
...enn/genn/code_generator/customUpdateGroupMerged.cc	74.03% <0.00%> (-20.71%)	⬇️
include/genn/genn/postsynapticModels.h	80.00% <0.00%> (-20.00%)	⬇️
... and 43 more

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[tnowotny]

haha ... the fix isn't that difficult or elaborate - suppose we could have done this a little bit earlier ;-)