Basic standard graphics

[Adam D. Ruppe]

> Actually, I think C functions should take ubyte* instead of char*
> because they aren't necessarily UTF-8

I thought about this a little more and changed my mind. char*
(maybe const) might not be ideologically pure but is the
best choice because:

a) It is what people expect

and b) It lets string literals keep working (with the ptr property)

(b) is a big helper in convenience and it helps C functions
feel like they belong in D instead of being annoying to work
with.