[TASK] Migrate DAM Category Migration from Task to CommandController
[BUGFIX] Don't migrate already imported categories again
[FEATURE] Migrate tx_dam_mountpoints to category_perms

tx_dam_mountpoints are holding the configuration of categories that
the user is allowed to use. This configuration must also be migrated
along the migration of tx_dam_cat to sys_category.
Merge commit 'a92979a136f35e924a2336a4deef6147bd24c4b8'

* commit 'a92979a136f35e924a2336a4deef6147bd24c4b8':
  [FEATURE] Migrate tx_dam_mountpoints to category_perms
  [BUGFIX] Don't migrate already imported categories again
  [TASK] Migrate DAM Category Migration from Task to CommandController

Conflicts:
	Classes/Task/MigrateDamCategoriesTask.php