The version of Campania we just updated to (2.008) works fine on Windows
but apparently fails on macOS, at least on some systems in some cases.
The version of Campania incldued here is still built from the same basic sources,
but it turns off the "Apple" option within FontForge and turns on "Old-style kern".
This appears to fix the problem.
Most of the rendering for RNA is handled by the Campania font,
so the main part of this change is just including the latest version of that font.
But I also needed to update some of the pre-processing of the RNA elements
to skip the special handling of parentheses and equals sign
(these too are handled directly by Campania).
Previous version allowed "t" as alias for triangle,
which breaks "It6" as abbreviation for Italian augmented sixth.
This version retains "^" as the alias triangle
(this was also supported in previous versions).
