Enable SwiftLint rule 'class_delegate_protocol' and fix all violations

.swiftlint.yml

@@ -10,7 +10,7 @@ whitelist_rules:
   - array_init
 #  - attributes # Contradicts with SwiftFormat option 'funcattributes = prev-line'.
   - block_based_kvo
-#  - class_delegate_protocol
+  - class_delegate_protocol
   - closing_brace
   - closure_body_length
   - closure_end_indentation

pass/Controllers/PasswordEditorTableViewController.swift

@@ -29,7 +29,7 @@ enum PasswordEditorCellKey {
     case type, title, content, placeholders
 }
 
-protocol PasswordSettingSliderTableViewCellDelegate {
+protocol PasswordSettingSliderTableViewCellDelegate: AnyObject {
     func generateAndCopyPassword()
 }
 

pass/Controllers/QRScannerController.swift

@@ -12,7 +12,7 @@ import passKit
 import SVProgressHUD
 import UIKit
 
-protocol QRScannerControllerDelegate {
+protocol QRScannerControllerDelegate: AnyObject {
     func checkScannedOutput(line: String) -> (accept: Bool, message: String)
     func handleScannedOutput(line: String)
 }

pass/Views/FillPasswordTableViewCell.swift

@@ -9,7 +9,7 @@
 import passKit
 import UIKit
 
-protocol FillPasswordTableViewCellDelegate {
+protocol FillPasswordTableViewCellDelegate: AnyObject {
     func generateAndCopyPassword()
     func showHidePasswordSettings()
 }