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
Fix margin of message boxes below page header
Rename .admin-page-* to .content-page-*

Also moved it from admin.scss to main.scss
It's not only useful for admin pages but also e.g. in some event
management areas.
Include admin.scss on all admin pages
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