xF2 Eklenti [DigitalPoint] Better Google Analytics 1.1.2.3

• Strip non-UTF8 characters from email subject when logging emails being read
• Wrap event for email send tracking in try/catch just in case Google Analytics servers are having issues

Moved initial Analytics JavaScript higher up in page execution chain (hopefully prevents third-party gtag() code from failing if wrapped in <xf:js /> tags)

Made the template modification that injects the main JavaScript work a little better (specifically made compatible with newer versions of XenForo).