v4.2.1

• ensure cite completion settings are read correctly (fixes #1604)
• fix bibtex parser throwing syntax error on unknown tokens between (outside of) @entries{...}
• fix a compatibility issue with ST4107 ... ST4131
• add support \thlabel and \thref (fixes #1463)
• use python's "oem" encoding to decode output of command line tools on Windows (ST4 only)