Version 5.3.0: Cleanup, MISRA rules, MSVC-style Inn specifiers

Changes since v5.2.0:

API and feature-set

• #51 : Now optionally supporting MSVC-style specific-size specifiers: I8, I16, I32, I64 (e.g. %I64d or %I32u). These are not part of the C standard, but they are convenient and appropriate for size-specific types like int64_t or uint32_t. A preprocessor (and CMake) option controls whether or not this support is included in the library - and it defaults to OFF for C standard compliance.
• #89 : Now using the same parameter names in printf.h as defined in the C standard (the parameter _types_were already standard-compliant, this is merely a cosmetic change).
• #90 : Doyxgen comment improvements in printf.h.

Build configuration

• The previous version, 5.2.0 was unfortunately released with an invalid version number (it was still 5.1.0); this time the version is set correctly in the CMakeLists.txt file.

Other changes

• #74 : All functions in printf.c without declarations in printf.h are now declared static, and should not be symbols exported by the compiled object file.
• Now Commenting-out additional code when PRINTF_EXPONENTIAL_SPECIFIERS is disabled.
• #77 : Applied several MISRA coding guidelines rules. The printf()-family functions themselves are not in line with the MISRA guidelines, but this can't be helped, since they must conform to the standard library signatures.
• #87 : Avoiding potential narrowing-conversion errors due to the int return type of printf()-family function vs the size_t type of the buffer range.
• Various purely-internal changes (#88, #91

Testing code

• #85 : No longer trying (and failing) to build the test suite when library function names are set to alias the standard library function names (since they conflict with catch).

Caveats

• Still no special handling for denormals.