- Dramatically reduce RAM usage: uses between 8 and 11 kilobytes less static
memory for its internal case-folding tables.
- Actually works now. It would fail unconditionally if a codepoint folded
into multiple codepoints, even if the compared string contained those exact
codepoints.
- Now a public API!
- Removed __PHYSFS_utf8strnicmp(): nothing was using it, it was incorrect
anyhow, and what does 'n' represent when either string might case-fold to
something larger in-flight, anyhow?
So now you can drop this into your program and not worry about filename
conflicts, or where "platform_unix.c" came from in the debugger, etc.
Also renamed the "beos" sources to "haiku" and "macosx" to "macos" to match
modern platform names.