Quesa and Mac 64 bit

[James W. W. <os...@jw...>]

I've just checked in changes to 19 files, based on Sean McBride's  
patch and a few tweaks of my own, to make Quesa compile in 64 bit mode  
on the Mac.

Most of the changes involve a new macro QUESA_SUPPORT_HITOOLBOX, which  
Quesa defines by default to be 0 in Mac 64 bit and 1 in Mac 32 bit.    
You could choose to define it to be 0 in 32 bit mode too.

When QUESA_SUPPORT_HITOOLBOX is 0, you cannot create Mac draw  
contexts, hence if you want to draw anything on the screen you must  
use Cocoa.  You also cannot use FSSpec storage objects.

A side effect of disabling Mac draw contexts is that currently pixmap  
draw contexts will not work on the Mac when QUESA_SUPPORT_HITOOLBOX is  
0.  If anyone cares, I'd guess it wouldn't be too hard to reimplement  
pixmap draw contexts using Cocoa or CGL.