change inttypes.h -> stdint.h, fix #ifdef condition for MSVC

These C99 integer types are declared in stdint.h, so inttypes.h is
not required.
Recent MSVC provides stdint.h with different typedefs from wavpack.h,
resulting in build issues on third party software that includes
both stdint.h and wavpack.h.

_MSC_VER <  1600:   no stdint.h
_MSC_VER <  1800:   provides stdint.h, no inttypes.h
_MSC_VER >= 1800:   provides both stdint.h and inttypes.h
fix unnecessary UTF-8 ligature of "fi" to ascii to shut up MSVC warnings
Merge branch 'msvc_fix' of https://github.com/nu774/WavPack