Add classes for all endpoints

[Nyholm]

From the docs.

Here is a list of endpoints:

• Absence transactions
• Account Charts
• Accounts
• Archive
• Article File Connections
• Article URL Connections
• Articles
• Asset File Connection
• Asset Types
• Assets
• Attendance transactions
• Company Settings
• Contract Accruals
• Contract Templates
• Contracts
• Cost Centers
• Currencies
• Customers
• Digital receipts
• Employees
• Expenses
• Financial Years
• Inbox
• Invoice Accruals
• Invoice Payments
• Invoices
• Labels
• Locked Period
• Modes of Payments
• Nox Finans Invoice
• Offers
• Orders
• Predefined Accounts
• Predefined Voucher Series
• Price Lists
• Prices
• Print Templates
• Projects
• Salary transactions
• Schedule times
• SIE
• Supplier Invoice Accruals
• Supplier Invoice External URL Connections
• Supplier Invoice File Connections
• Supplier Invoice Payments
• Supplier Invoices
• Suppliers
• Tax Reductions
• Terms of Deliveries
• Terms of Payments
• Trusted Email Domains
• Trusted Email Senders
• Units
• Voucher File Connections
• Voucher Series
• Vouchers
• Warehouse
• Way of Deliveries