v4.3

What's Changed

• fix broken menu item handling by @TomTasche in #453
• have CoreLoader support XLSX by @TomTasche in #455
• add test to verify if sheet names are used for tab labels by @TomTasche in #456
• Remove file mode by @TomTasche in #457
• Investigate DOCX editing by @TomTasche in #458

Full Changelog: v4.2...v4.3