Draft: Resolve "users cannot publicly share their dashboards"

Closes #112

Grafana Users can create their own dashboards in their respective Project Organizations. However, they can not publicly share their dashboards, as they need elevated privileges to do that.

GF_USERS_EDITORS_CAN_ADMIN=true should fix this.

This only gives them admin rights for dashboard, dashboard folders and teams in their project.

How to test:

• fire it up
• create a thing
• log in with AAI
• view dashboard
• click on big blue Share button
• click on public dashboard
• accept the three check boxes and create public dashboard
  • can be revoked at any time