Introduce light-yellow color
Create qtip-warning
Add has-warning class
Create and use $.fn.tooltip
Fix typo
More flexible form error display

- support custom tooltip anchor
- add helper to reposition qtips (e.g. when adding items to the DOM)
- fix error border for i-table-widget
Add asterisk for required fields
Change fieldset layout
Support **kwargs in custom widgets
Make required fields more obvious
Align required asterisk for multi-line fields
Disable :invalid style
Add payment blueprint, menu item and basic WP/RH
Add settings (only currency so far)
Add event-specific settings (EventSettingProxy)
Change url for legacy epayment settings
Add event-specific payment settings
Use the email messages from the new settings

Also removed a useless check that was always true
Use the new payment enabled setting
Create and apply i-data-list CSS class