simpledisplay.d now works on as 64 bit on X

[Adam D. Ruppe]

I know someone here was asking about my simpledisplay.d on 64 bit 
a while ago.. I don't remember who so here's a general 
announcement.

I got it working for at least the parts I tried (display image, 
get keyboard input) compiled with -m64:

https://github.com/adamdruppe/misc-stuff-including-D-programming-language-web-stuff/blob/master/simpledisplay.d

Quite a hassle, my xlib binding was apparently almost completely 
wrong, and it worked on 32 bit just by sheer luck. Many of the 
structs were the wrong sizes even there! General tip to C 
porters: do a static assert(S.sizeof) and make sure it matches 
what your C program gives. I got snagged in part here because 
unsigned long in X is apparently 64 bit. I thought it was the 
same as D's uint in all cases.

The file it also depends on color.d from the same repo. Another 
minor change is the key event used to take a delegate (int 
key){}. Now it takes (int key, bool pressed) instead. There's a 
static assert with a reminder message too, so just compile and if 
you need it, it will tell you. The (dchar){} event remains the 
same as before.

Been a few random bug fixes in the last few months too, timer 
events now work right on windows and linux is the big one that 
comes to mind.