Added permissions for inventory editing and permission groups
+ Added permissions invsave.inventory.offline.edit for editing player offline inventory (/invsave view <player> command)
+ Added permissions invsave.enderchest.offline.edit for editing player offline inventory (/invsave view <player> enderchest command)
+ Added permissions invsave.inventory.history.edit for editing player history inventory (/invsave history <player> command)
+ Added permissions invsave.enderchest.history.edit for editing player history inventory (/invsave history <palyer> enderchest command)
+ Added permissions invsave.inventory.actual.edit for editing player online inventory (/invsave edit <player> command)
+ Added permissions invsave.enderchest.actual.edit for editing player online inventory (/invsave edit <player> enderchest command)
+ Added permission group invsave.events.* for all InventorySaver events
+ Added permission group invsave.commands.* for all InventorySaver commands