translate portions of codebase to C

[GoogleCodeExporter]

Andy's comment:

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Porting to C/C++ would also provide an opportunity to build to other
OS's -- namely Mac, which has been the most requested feature.

Most of the ABox code is UI stuff, so the difficulties would lean
towards Win32 issues. But there are a few things that ABox does with
lists that I haven't figured out how to cleanly code in C++. As I
catch up on documentation I'll elaborate more.

Original issue reported on code.google.com by [email protected] on 19 Mar 2011 at 12:30