Ensure classes have public initializers

Author: dannys42

Sources/SwiftShellUtilities/SystemActionPrint.swift

@@ -15,6 +15,9 @@ public class SystemActionPrint: SystemAction {
     public var createFileStyle: PrintStyle = [ Style.bold ]
     public var runAndPrintStyle: PrintStyle = [ Style.bold ]
 
+    public init() {
+    }
+
     public func heading(_ type: SystemActionHeading, _ string: String) {
         switch type {
         case .section:

Sources/SwiftShellUtilities/SystemActionReal.swift

@@ -5,6 +5,9 @@ import SwiftShell
 public class SystemActionReal: SystemAction {
     public var swiftShellContext: Context = main
 
+    public init() {
+    }
+
     public func heading(_ type: SystemActionHeading, _ string: String) {
         // do nothing
     }