1.4.0: Rework infinite scroll & text formatting

Changelog

• Vue 3 is now fully compatible with the next branch
• Remove vue-infinite-loading dependency and replace it with IntersectionObserver api 97f1a34
• Add scroll-distance prop to trigger fetch-messages event at a specific pixel distance #111
• Remove emoji picker extra scrollbar on Windows #239

Breaking Changes

• Rework text-formatting to set custom markdown characters #247