Permission rework

[bmarty]

Especially better handling of the "denied forever" permission user story.

Add a new debug screen to play with permission request from the application.

so now when requesting permissions:

• already granted: sync call (no change on this part)
• not yet granted:
  • user give permission: async success
  • user denies: no more thing to do, the action is not performed
  • user denies and check do not ask again: no more thing to do, the action is not performed
• not yet granted, user has previously checked do not ask again:
  • a dialog or a snackbar is displayed to ask the user to open the system settings to grant the permission

permissions.mp4

[BillCarsonFr]

LGTM