General fixes, compat issues, and typing updates

Explicit shoutout out to these contributors for their support!

@vishnutsivan
@cgross
@stof
@bobwhitelock
@fglueck
@f0rmat1k
@jwbth
@agrafix
@simonlary
@jseminck
@sassy
@valentinsteinwandter
@valentinstn

What's Changed

• Add autocompleteSeparator parameter by @valentinstn in #406
• fix type error used NodeList of attach/detach on TypeScript by @sassy in #488
• Add menuItemLimit to README and types by @jseminck in #447
• Loading item template by @cgross in #490
• Fix and update the TypeScript typings by @simonlary in #553
• Change event handling order to be compatible with QuillJs by @agrafix in #554
• Remove redundant code related to whitespace characters by @jwbth in #563
• Fixed wrong if (window) check by @f0rmat1k in #508
• Compatibility with IE11 by @fglueck in #592
• Fix spaceSelectsMatch causing error (fixes #495) by @bobwhitelock in #529
• Fix type definitions for the selectTemplate option by @stof in #702
• Multiple positioning fixes by @cgross in #491
• Fix trigger char not getting removed when replaceTextSuffix is empty … by @vishnutsivan in #686
• General bumps in dependencies and security issues

Full Changelog: 5.1.3...5.1.4