Reorganize AltStore project into UIKit and SwiftUI folders

AltStore/SwiftUI/Protocols/Filterable.swift

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+//
+//  Filterable.swift
+//  SideStore
+//
+//  Created by Fabian Thies on 01.12.22.
+//  Copyright © 2022 SideStore. All rights reserved.
+//
+
+import Foundation
+
+protocol Filterable {
+    func matches(_ searchText: String) -> Bool
+}
+
+extension Collection where Element: Filterable {
+    func matches(_ searchText: String) -> Bool {
+        self.contains(where: { $0.matches(searchText) })
+    }
+    
+    func items(matching searchText: String) -> [Element] {
+        self.filter { $0.matches(searchText) }
+    }
+}

AltStore/SwiftUI/Protocols/NavigationTab.swift

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+//
+//  NavigationTab.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import Foundation
+import SFSafeSymbols
+
+protocol NavigationTab: RawRepresentable, Identifiable, CaseIterable, Hashable where RawValue == Int {
+    static var defaultTab: Self { get }
+    var displaySymbol: SFSymbol { get }
+    var displayName: String { get }
+}
+
+extension NavigationTab {
+    var id: Int {
+        self.rawValue
+    }
+}

AltStore/SwiftUI/Protocols/ViewModel.swift

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+//
+//  ViewModel.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+
+protocol ViewModel: ObservableObject {}