implemented component for displaying items
improved item-table: remove row; add new row; add product
updated item-table
changes in template; added validation
added translations; adapted styling
added overall price calculation to items-table
added translations for overall price
fixed issues in item-table; fixed composer.json
cleanups
changed translations
Merge pull request #2 from sulu-cmf/feature/item-table

[FEATURE] Added item-table component for visually managing items