2.1.21-beta3

• Resolves an issue where comment counts do not update after delete or spam operations #141
• Improves user experience on mobile breakpoints #139
• Replaces the previous filter expression parser to resolve many issues:
  • Allows multiple where filters in Antlers templates
  • Prevents the same filter from overwriting a previously declared instance
  • Invalid group and filter names are now detected before loading comments into memory
  • Provides consistent behavior when supplying multiple parameters
  • Allows developers to escape quotes and backslashes in string literals
  • Improves comment filter parsing performance
  • Improves error messages and error recovery when syntax errors are detected