Add regional schema for Switzerland

[digitalentity]

Fixes #768, allowes to specify Tax ID (VAT number) if country is Switzerland, propagates the taxId attribute to print object to be usable in the print templates.

[mildred]

I believe this might be useful for more than just Swizerland in the end. Probaby all EU countries

[mildred]

I believe this list should be compared to

books/schemas/app/AccountingSettings.json

Lines 125 to 132 in 8bf0a5f

	"quickEditFields": [
	"fullname",
	"email",
	"companyName",
	"country",
	"fiscalYearStart",
	"fiscalYearEnd"
	]

I suppose the field currency was copied from the Indian regional schema. Does it makes sense for Swizerland?

[digitalentity]

While CHF is the national currency in Switzerland it is not uncommon for accounting to be done in EUR, especially if this is a company selling services in EU.

[mildred]

If this is intentional, no problem, I supposed something like this. But if this was just copy and paste from Indian regional schema, perhaps this did not need to be included.

[digitalentity]

EU is a bit more complicated, but EU countries may benefit from a shared regional schema, but that schema will likely be different than Swiss (VAT numbers are not the same format).

[mildred]

Can you run the linter over the sources files, and perhaps remove the currency quick edit field?

Files needing linting:

[warn] schemas/regional/ch/AccountingSettings.json
[warn] schemas/regional/index.ts

command to run:

npx prettier -w schemas

[digitalentity]

Done, also squashed the commits