[AltStoreCore] Adds Date, FileManager, and UIColor extensions

AltStoreCore/Extensions/Date+RelativeDate.swift

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+//
+//  Date+RelativeDate.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/28/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+public extension Date
+{
+    func numberOfCalendarDays(since date: Date) -> Int
+    {
+        let today = Calendar.current.startOfDay(for: self)
+        let previousDay = Calendar.current.startOfDay(for: date)
+        
+        let components = Calendar.current.dateComponents([.day], from: previousDay, to: today)
+        return components.day!
+    }
+    
+    func relativeDateString(since date: Date, dateFormatter: DateFormatter) -> String
+    {
+        let numberOfDays = self.numberOfCalendarDays(since: date)
+        
+        switch numberOfDays
+        {
+        case 0: return NSLocalizedString("Today", comment: "")
+        case 1: return NSLocalizedString("Yesterday", comment: "")
+        case 2...7: return String(format: NSLocalizedString("%@ days ago", comment: ""), NSNumber(value: numberOfDays))
+        default: return dateFormatter.string(from: date)
+        }
+    }
+}

AltStoreCore/Extensions/FileManager+SharedDirectories.swift

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+//
+//  FileManager+SharedDirectories.swift
+//  AltStore
+//
+//  Created by Riley Testut on 5/14/20.
+//  Copyright © 2020 Riley Testut. All rights reserved.
+//
+
+import Foundation
+
+public extension FileManager
+{
+    var altstoreSharedDirectory: URL? {
+        guard let appGroup = Bundle.main.appGroups.first else { return nil }
+        
+        let sharedDirectoryURL = self.containerURL(forSecurityApplicationGroupIdentifier: appGroup)
+        return sharedDirectoryURL
+    }
+    
+    var appBackupsDirectory: URL? {
+        let appBackupsDirectory = self.altstoreSharedDirectory?.appendingPathComponent("Backups", isDirectory: true)
+        return appBackupsDirectory
+    }
+    
+    func backupDirectoryURL(for app: InstalledApp) -> URL?
+    {
+        let backupDirectoryURL = self.appBackupsDirectory?.appendingPathComponent(app.bundleIdentifier, isDirectory: true)
+        return backupDirectoryURL
+    }
+}

AltStoreCore/Extensions/UIColor+AltStore.swift

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+//
+//  UIColor+AltStore.swift
+//  AltStore
+//
+//  Created by Riley Testut on 5/9/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+public extension UIColor
+{
+    private static let colorBundle = Bundle(for: DatabaseManager.self)
+    
+    static let altPrimary = UIColor(named: "Primary", in: colorBundle, compatibleWith: nil)!
+    static let deltaPrimary = UIColor(named: "DeltaPrimary", in: colorBundle, compatibleWith: nil)
+    
+    static let altPink = UIColor(named: "Pink", in: colorBundle, compatibleWith: nil)!
+    
+    static let refreshRed = UIColor(named: "RefreshRed", in: colorBundle, compatibleWith: nil)!
+    static let refreshOrange = UIColor(named: "RefreshOrange", in: colorBundle, compatibleWith: nil)!
+    static let refreshYellow = UIColor(named: "RefreshYellow", in: colorBundle, compatibleWith: nil)!
+    static let refreshGreen = UIColor(named: "RefreshGreen", in: colorBundle, compatibleWith: nil)!
+}