[FEATURE] implemented new widget for sidebar

__Tasks:__

- [x] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | -
| Fixed tickets | -
| BC Breaks     | -
| Doc           | -

__Requires:__
- https://github.com/sulu-cmf/SuluSalesCoreBundle/pull/7
- https://github.com/sulu-cmf/SuluSalesShippingBundle/pull/4

__Issues:__
- https://github.com/massiveart/POOL-ALPIN/issues/182

isn't there a function for getting global vars?