Restructure libray

[nohponex]

• Allow multiple instances with multiple authorization headers API endpoints
  • Helper classes for authorization needed
• Don't rely on phramework/jsonapi implementation
• Extend resource-models in a similar way with phramework/jsonapi 3.x
• Use PSR-7 for request/response
• Support GET
• Support GET /{id}
• Support POST
• Support PATCH /{id}
• Support PUT /{id}
• Support DELETE /{id}
• Unit test GET
• Unit test GET /{id}
• Unit test POST
• Unit test PATCH /{id}
• Unit test PUT /{id}
• Unit test DELETE /{id}