Base string transforms

[Dan Sugalski]

Time to add these in.

I'm going to be adding in the following to the chartype vtable:

upcase
downcase
titlecase
to_chartype

To transform things to upper-case, lowercase, titlecase (initial
capital, basically), and to transform the string to an arbitrary
different chartype.

I'd like to get some alternative chartypes and encodings into parrot
as soon as we possibly can, to make sure that we can actually handle
things without resorting to unicode in all cases. (Which probably
means I need to grab O'reilly's "CJKV Information Processing " off my
shelf and start in on it--if anyone's got a better reference (or one
that covers different languages) I'd be happy enough to have it...)
--
Dan

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