XRechnung Visualization 2022-05-31 compatible with XRechnung 2.2.0

Added

• Several more test documents
• Guide for visual testing

Changed

• Added FileSaver.js for better cross-browser attachment download functionality
• Created ubl-common-xr.xsl for common named templates as a single point of change
• Handling of calendar date display is now more robust

Fixed

• Missing display of BG-32 (thanks to GitHub user @JannickWeisshaupt)
• BT-47 bug in UBL CreditNote
• Logic and display of BT-110 and BT-111 in CII
• Display of percentage sign for VAT percentage rate
• Missing tooltips in HTML