Improves App ID counting + management

Fetches App ID count directly from Apple, and adds AppIDsViewController to view all App IDs for the logged-in account.

AltStore/Model/Team.swift

@@ -43,6 +43,7 @@ class Team: NSManagedObject, Fetchable
     /* Relationships */
     @NSManaged private(set) var account: Account!
     @NSManaged var installedApps: Set<InstalledApp>
+    @NSManaged private(set) var appIDs: Set<AppID>
     
     var altTeam: ALTTeam?
     
@@ -55,13 +56,18 @@ class Team: NSManagedObject, Fetchable
     {
         super.init(entity: Team.entity(), insertInto: context)
         
+        self.account = account
+        
+        self.update(team: team)
+    }
+    
+    func update(team: ALTTeam)
+    {
         self.altTeam = team
         
         self.name = team.name
         self.identifier = team.identifier
         self.type = team.type
-        
-        self.account = account
     }
 }