Implement permissions and groups

[Ramin-RX7]

Implement permissions and groups for the project

These have to be implemented:

• normal staff
  • view tables, foods, categories, orders, users, social, main_info
  • change orders
• super staff
  • all permissions of normal staff + add, delete and change
• manager
  • all possible permission except: delete main_info,social

Also add a custom permission named analytics. Use this to prevent normal and super staff see the pages/views/links related to analytics

[Ramin-RX7]

completed in #159