Replace SIZE_FORMAT with 'z' length modifier

C99 introduced the 'z' length modifier for formatted output. Quoting from the C99 standard (7.19.6.1/7)

"Specifies that a following d, i, o, u, x, or X conversion specifier applies to a size_t or the corresponding signed integer type argument;"

Because C99 is implicitly available with C++14, we can now use the 'z' modifier instead of the more verbose and clumsy to use SIZE_FORMAT and friends provided by globalDefinitions.hpp.