You can now make an appleseed refer directly to a specific header.

All that was needed was adding public.c-header to the path control's list of allowed types.
Fix documents being saved with the company name as the company ID.
We need to make sure we call this on the main thread.

terminationHandler may be called on a different thread, in which case we get an exception if we call this directly.
appledoc supports loading settings from an AppledocSettings.plist file, so let's just use that.

Death to source root URL property and corresponding path control.
Documented the developer name (--project-company) field.