move Kwf.onElementReady into own dependency
use jQuery trigger for onElementReady

- better browser compatibility
- faster in chrome
use KwfOnReady in components where required
use javascript based media-query-like functionality to adapt to possible width
Change date-picker-field to work with hideTrigger-class-field of ext-dateField

This is also changed for frontend. Additionally for backwards-compatibility old functions
are now working with new class-field.
add helper method for implementing responsive element