Holded invoicing and much morev3.18.0

What changed

• UXEdit contacts directly within the document creation flow
• UXCreate documents directly from the preview screen
• New featureCreate new tax entries directly from the document line item
• New featureSupport for negative quantities, prices, and totals for refunds and discounts
• PerformanceImproved loading performance in the document editor
• PerformanceOptimized loading experience in the notification center

Original release notes

What's new:
- Edit a contact without leaving the document you're creating.
- Create the document straight from the preview.
- Missing a tax? Create it right from the line.
- Use negative quantities, prices and totals for refunds and discounts.
- Smoother loading in the document editor.
- Cleaner loading in the notification center.