unicode internal font handling

[Ben Wing]

ok stephen, maybe you can explain this to me.  i've done much of the 
coding towards using unicode internally.  but i'm running into problems 
with all the font-handling stuff in faces.c, which is completely done in 
terms of charsets.  in the unicode world, there will be no leading 
bytes.  i am redoing the places that use an array of fonts indexed by 
leading byte to use a hash table, but that doesn't solve the underlying 
problem that fonts are still being determined by doing things like "find 
all the charsets in a string and then make sure there's a font available 
for each charset".  what should the model be instead?  and how to do 
this in a way that works both with the old X font code and the new xft code?

ben