Add 'codegen.cpp.msvc_debug' flag to speed up MSVC compilation on Windows #1730
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Fixes #1729
Changes:
codegen.cpp.msvc_debugpreference (default: False).cpp_prefs.pyto use/Od(No Optimization) instead of/Oxwhen this flag is enabled.Verification:

Verified locally that
Synapses.connecttime for 10k neurons drops from 11.8s to 0.06s when enabled.