[AltStoreCore] Refactors core AltStore logic into AltStoreCore framework

AltStoreCore will contain all shared AltStore code between AltStore and any app extensions. Initially, it includes all AltStore model logic.

AltStoreCore/Model/Team.swift

@@ -0,0 +1,80 @@
+//
+//  Team.swift
+//  AltStore
+//
+//  Created by Riley Testut on 5/31/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+import AltSign
+
+public extension ALTTeamType
+{
+    var localizedDescription: String {
+        switch self
+        {
+        case .free: return NSLocalizedString("Free Developer Account", comment: "")
+        case .individual: return NSLocalizedString("Developer", comment: "")
+        case .organization: return NSLocalizedString("Organization", comment: "")
+        case .unknown: fallthrough
+        @unknown default: return NSLocalizedString("Unknown", comment: "")
+        }
+    }
+}
+
+public extension Team
+{
+    static let maximumFreeAppIDs = 10
+}
+
+@objc(Team)
+public class Team: NSManagedObject, Fetchable
+{
+    /* Properties */
+    @NSManaged public var name: String
+    @NSManaged public var identifier: String
+    @NSManaged public var type: ALTTeamType
+    
+    @NSManaged public var isActiveTeam: Bool
+    
+    /* Relationships */
+    @NSManaged public private(set) var account: Account!
+    @NSManaged public var installedApps: Set<InstalledApp>
+    @NSManaged public private(set) var appIDs: Set<AppID>
+    
+    public var altTeam: ALTTeam?
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    public init(_ team: ALTTeam, account: Account, context: NSManagedObjectContext)
+    {
+        super.init(entity: Team.entity(), insertInto: context)
+        
+        self.account = account
+        
+        self.update(team: team)
+    }
+    
+    public func update(team: ALTTeam)
+    {
+        self.altTeam = team
+        
+        self.name = team.name
+        self.identifier = team.identifier
+        self.type = team.type
+    }
+}
+
+public extension Team
+{
+    @nonobjc class func fetchRequest() -> NSFetchRequest<Team>
+    {
+        return NSFetchRequest<Team>(entityName: "Team")
+    }
+}