htod - convert C .h files to D import files

[Stewart Gordon]

Lionello Lunesu wrote:
>>>>> * signed char => sbyte
>>>> What's the issue?
>>> dmd claims (correctly) it doesn't know about sbyte:
>>> gl.d(42): identifier 'sbyte' is not defined
>> <slaps forehead> Arrgh!
> 
> Hey! Don't get me wrong! I've posted before that "byte" should be unsigned! 
> So, create an sbyte for the signed byte and let's have a laugh about it.

The integer types are designed to be named consistently with each other.

byte, short, int and long are signed.
ubyte, ushort, uint and ulong are unsigned.

Stewart.