Add vat rate to town6 settings

[Tschuppi81]

Org/Town6: Configure and display VAT amount

TYPE: Feature
LINK: ogc-2051

Checklist

• I have performed a self-review of my code
• I considered adding a reviewer
• I have updated the PO files
• I made changes/features for both org and town6
• I have tested my code thoroughly by hand
• I have added tests for my changes/features

[linear]

OGC-2051 Betrag MwSt. auf Belegen anzeigen

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.20%. Comparing base (1ddb434) to head (a85a753).

Files with missing lines	Patch %	Lines
src/onegov/org/layout.py	91.66%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/core/layout.py	97.19% <ø> (ø)
src/onegov/org/forms/settings.py	79.74% <100.00%> (+0.07%)	⬆️
src/onegov/org/models/organisation.py	98.02% <100.00%> (+<0.01%)	⬆️
src/onegov/org/views/settings.py	81.56% <100.00%> (+0.42%)	⬆️
src/onegov/pay/utils.py	100.00% <100.00%> (+2.50%)	⬆️
src/onegov/town6/views/settings.py	98.11% <100.00%> (+0.07%)	⬆️
src/onegov/org/layout.py	91.71% <91.66%> (+0.48%)	⬆️

... and 192 files with indirect coverage changes

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