* UI: Deprecate the custom CSS options
As discussed with @pavlenex we are deprecating the custom CSS options for particular entities (payemnt request, pull payment, POS, crowdfund) in favor of the store branding approach.
This displays the custom CSS section only if these values are set already.
* Add IDs to html element
This will allow styling of individual entities.
* Server Settings: Customize instance name and add contact URL
- The custom instance name would improve #5563
- Added contact URL closes#4806
* Fix custom logo display
* Store Branding: Refactoring and logo as favicon
- Encapsulates store branding properties into their own view model
- Uses the logo as favicon on public pages
* Refactorings
* Updates
* Add grouping feature to the PoS with Cart
* Improve UI
* Rename groups to categories
* Make it easier to select categories of the items
* Refactor TemplateEditor, use TomSelect for categories
* Prevent Vue code insertion
* Prevent empty categories
* Add label ids
* Add test case
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Co-authored-by: Dennis Reimann <mail@dennisreimann.de>
* UI updates
* Updates modes and calculation
* Unify tip buttons
* White caret
* Add top margin to calculation
* Add space between mode buttons and keypad
* Discount updates
