Introduce more chat customization options

[vernondegoede]

This PR introduced a few non-breaking changes:

• Introduced a few more options:
  • bot.name -> This will be the display name of the bot in the chat itself
  • bot.avatarUrl -> This will be the avatar shown for the bot. This can be useful for companies who want to show their own logo there.
  • user.avatarUrl -> This will show the avatar of the user. This can make the chat feel a bit more personal if a company has user avatars in the rest of their product.
  • warnBeforeClose -> This determines whether the "warning" dialog should be shown when clicking the X button in the top-right corner of the chat.
• Added NL translations
• Removed dead code, ran Prettier on all widget files and some other minor refactors to make things a bit more readable.