Mule-ization of Carbon work

Andrew -- I took a look at your code and it should not be difficult to make the strings work correctly with internationalized text. Basically, you just need to figure out what encoding of text the external API's expect and then call the appropriate conversion functions. For example, if the API's expect UTF-8, then some variation of replacing XSTRING_DATA (string) with NEW_LISP_STRING_TO_EXTERNAL (string, Qutf8) should do the trick. This returns a string in alloca() space so there is no need to free it. (The GTK code doesn't always do this currently but there is a pending patch among my workspaces to fix this.) ben