if it's available. Linking against the static Unicode Converter library
costs us about 30k on Classic 68K, which I can live with.
Because the default fallback converter can generate multiple output
characters for a single input character, we provide our own fallback that
doesn't. It converts everything to '?' instead.
[originally from svn r2315]
ignore when breaking text into runs for display, and implement setting this
on Mac (other ports just use 0xffffffff).
We don't use DeviceLoop for this any more because Apple Technical Q&A
QA1024 says we shouldn't. Unlike their example, we don't depend on the
Display Manager's being present either.
[originally from svn r2264]
This doesn't include any mkfiles.pl glue, and is missing one or two other
fixes. The terminal emulator is kind of working, though, as, I believe, is
the store module. Everything else is yet to be done.
[originally from svn r2226]
