* UI: Improve invoice view
- General improvements for the spacings on the page
- Hides rows of data in case they aren't present
- Improved the PoS data view so that it renders complex objects nicely and adds links for URLs
TDB: For the last row "Links" there's now a special `_urls` property, which renders a list of urls with the key being the title and the value being the URL.
* Update BTCPayServer/Views/Invoice/Invoice.cshtml
Co-authored-by: Andrew Camilleri <evilkukka@gmail.com>
* UI: Handle arrays in PosData view
Co-authored-by: Andrew Camilleri <evilkukka@gmail.com>
