Custom interactive messages with widgets for user input

The ability for a user or a bot to create interactive messages which consist of custom placed widgets.

Message concept:

This is what every other server member sees. Each member has their own instance of this message which they can manipulate.

Creator concept:

1. Clicking this icon will open up the widget creator.
2. Add a new widget below the existing ones
3. Preview the Apply button. Further buttons can be added
4. Send the custom message.

Possible widgets:
Label: Just bare text to be displayed with markdown
Switch: Can be on or off. Optionally there can only be one checked switch
Textfield: A user can enter text
Button: A button applies all changes and sends them to the server. If there is more than one button then it must be saved which button has been pressed.
Image: An image can be inserted and resized from a file or image link

This feature would be useful for creating surveys, votes, polls, etc. It would be possible to create these messages via the API so that bot developers can automate these messages. This would allow the creation of e.g. card games inside of discord. If it was possible to edit text labels while users are still changing the settings these labels could be updated with new game information (e.g. how many players have applied their messages).