Replace ctype.h function calls with new MSVC-safe XPDEV macros
I'm fed-up with MSVC assertions in ctype functions (e.g. isdigit, isprint, isspace, etc.) when called with out-of-range (e.g. negative) values. This problem only affects MSVC debug builds, but if you run them (like I do), these things are like little time bombs that can drive you crazy (knocking your board out of service). The new macros names are bit more descriptive as well.
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