Refactor YesNtWindowStatements to use constructor for ownerProcess

Processes/YesNtInterpreterProcess.cs

@@ -22,7 +22,7 @@ public class YesNtInterpreterProcess() : Process("YesNtInterpreter")
         ];
         interpreter = new();
 
-        YesNtWindowStatements.Register(interpreter, this);
+        new YesNtWindowStatements(this).Register(interpreter);
 
         interpreter.Prepare([.. args]);
     }

Utils/YesNtWindowStatements.cs

@@ -33,7 +33,7 @@ namespace RemSox.Utils;
 ///   %win_last_id   expands to the id of the last created window
 ///   %ui_last_id    expands to the id of the last created UI element
 /// </summary>
-public class YesNtWindowStatements
+public class YesNtWindowStatements(Process ownerProcess)
 {
     // Maps script-visible integer ids to actual Window objects.
     private readonly Dictionary<int, Window> windows = [];
@@ -42,8 +42,6 @@ public class YesNtWindowStatements
     private int lastWindowId = 0;
     private int lastUiId = 0;
 
-    private Process ownerProcess = null!;
-
     /// <summary>
     /// Call this from <see cref="YesNtInterpreterProcess.Start"/> to register
     /// every window-related statement with the given interpreter.
@@ -53,10 +51,8 @@ public class YesNtWindowStatements
     ///   The <see cref="Process"/> that will own created windows
     ///   (usually the <see cref="YesNtInterpreterProcess"/> itself).
     /// </param>
-    public void Register(YesNtInterpreter interpreter, Process ownerProcess)
+    public void Register(YesNtInterpreter interpreter)
     {
-        this.ownerProcess = ownerProcess;
-
         RegisterWindowStatements(interpreter);
         RegisterButtonStatement(interpreter);
         RegisterCheckBoxStatement(interpreter);