Rename package and address warnings

Sources/SwiftUIMath/MathRender/MTColor.swift

@@ -0,0 +1,28 @@
+
+//
+//  Created by Mike Griebling on 2022-12-31.
+//  Translated from an Objective-C implementation by Markus Sähn.
+//
+//  This software may be modified and distributed under the terms of the
+//  MIT license. See the LICENSE file for details.
+//
+
+import Foundation
+
+extension MTColor {
+    
+    public convenience init?(fromHexString hexString:String) {
+        if hexString.isEmpty { return nil }
+        if !hexString.hasPrefix("#") { return nil }
+        
+        var rgbValue = UInt64(0)
+        let scanner = Scanner(string: hexString)
+        scanner.charactersToBeSkipped = CharacterSet(charactersIn: "#")
+        scanner.scanHexInt64(&rgbValue)
+        self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16)/255.0,
+                  green: CGFloat((rgbValue & 0xFF00) >> 8)/255.0,
+                  blue: CGFloat((rgbValue & 0xFF))/255.0,
+                  alpha: 1.0)
+    }
+    
+}