Rename package and address warnings

Sources/SwiftUIMath/MathRender/MTLabel.swift

@@ -0,0 +1,37 @@
+//
+//  Created by Mike Griebling on 2022-12-31.
+//  Translated from an Objective-C implementation by 安志钢.
+//
+//  This software may be modified and distributed under the terms of the
+//  MIT license. See the LICENSE file for details.
+//
+
+import Foundation
+import SwiftUI
+
+#if os(macOS)
+
+public class MTLabel : NSTextField {
+    
+    init() {
+        super.init(frame: .zero)
+        self.stringValue = ""
+        self.isBezeled = false
+        self.drawsBackground = false
+        self.isEditable = false
+        self.isSelectable = false
+    }
+    
+    required init?(coder: NSCoder) {
+        super.init(coder: coder)
+    }
+    
+    // MARK: - Customized getter and setter methods for property text.
+    var text:String? {
+        get { super.stringValue }
+        set { super.stringValue = newValue! }
+    }
+    
+}
+
+#endif