A small step to migrate to C99

The following changes were made with the intention of start porting the code to C99:

• Replaced the Int* and Uint* types with the int*_t and uint*_t types defined in stdint.h.
• Replaced Bool and the True and False macros with those defined in stdbool.h.
• Replaced the UInt64 struct with the actual uint64_t type and rewrote the relevant functions.
• Replaced the UInt64 formatting with the PRIu64 macro from inttypes.h.
• Replaced MaybeUInt64 with uint64_t.
• Replaced NativeInt with int.
• Added the const qualifier to the randomizing, CRC, and Knuth's increment arrays.
• Added the const qualifier to a few function parameters.
• Replaced the GCC extension __inline__ with the keyword inline.
• Replaced the VPrintfX macros with a variadic macro VPrintf.
• Replaced a few portions of code with calls to standard library functions such as memcpy(), memmove(), memset(), strncpy().
• Replaced a few macros with equivalent inline functions.
• Reworked some of the literals to remove type mismatch warnings, used the UINT*_C macros for unsigned literals.
• Made a few "simplifications" and casts, such as using some K&R idioms.

Thank you for your attention.