StockTracking enhancement

[Hu1buerger]

TODO:

Model enhancement

• [ ] link stockevent to stockitem to show the current remaining
  => UX

User functionality

• [ ] let the user pick whether to take from => could lead to unexpected behaviour
• [ ] let the user "remove from stock" (as a non intake related event) => UX, Fix user error, or other

Graphic related

• [ ] show if we are trying to pick from stock

User guidance

• [x] stock_item_detail should open on click on item
  • [ ] show details (image, editing / adding image....)
  • [ ] quick option (-5, -10, -20, ...)
  • [x] remove all
  • [x] delete

See #1 for context