[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/InstalledExtension.swift

@@ -0,0 +1,75 @@
+//
+//  InstalledExtension.swift
+//  AltStore
+//
+//  Created by Riley Testut on 1/7/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+import AltSign
+
+@objc(InstalledExtension)
+public class InstalledExtension: NSManagedObject, InstalledAppProtocol
+{
+    /* Properties */
+    @NSManaged public var name: String
+    @NSManaged public var bundleIdentifier: String
+    @NSManaged public var resignedBundleIdentifier: String
+    @NSManaged public var version: String
+    
+    @NSManaged public var refreshedDate: Date
+    @NSManaged public var expirationDate: Date
+    @NSManaged public var installedDate: Date
+    
+    /* Relationships */
+    @NSManaged public var parentApp: InstalledApp?
+    
+    private override init(entity: NSEntityDescription, insertInto context: NSManagedObjectContext?)
+    {
+        super.init(entity: entity, insertInto: context)
+    }
+    
+    public init(resignedAppExtension: ALTApplication, originalBundleIdentifier: String, context: NSManagedObjectContext)
+    {
+        super.init(entity: InstalledExtension.entity(), insertInto: context)
+        
+        self.bundleIdentifier = originalBundleIdentifier
+        
+        self.refreshedDate = Date()
+        self.installedDate = Date()
+        
+        self.expirationDate = self.refreshedDate.addingTimeInterval(60 * 60 * 24 * 7) // Rough estimate until we get real values from provisioning profile.
+        
+        self.update(resignedAppExtension: resignedAppExtension)
+    }
+    
+    public func update(resignedAppExtension: ALTApplication)
+    {
+        self.name = resignedAppExtension.name
+        
+        self.resignedBundleIdentifier = resignedAppExtension.bundleIdentifier
+        self.version = resignedAppExtension.version
+
+        if let provisioningProfile = resignedAppExtension.provisioningProfile
+        {
+            self.update(provisioningProfile: provisioningProfile)
+        }
+    }
+    
+    public func update(provisioningProfile: ALTProvisioningProfile)
+    {
+        self.refreshedDate = provisioningProfile.creationDate
+        self.expirationDate = provisioningProfile.expirationDate
+    }
+}
+
+public extension InstalledExtension
+{
+    @nonobjc class func fetchRequest() -> NSFetchRequest<InstalledExtension>
+    {
+        return NSFetchRequest<InstalledExtension>(entityName: "InstalledExtension")
+    }
+}