Store settings in settings.xml instead of registry.

src/Misc/Settings.cs

@@ -0,0 +1,56 @@
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.IO;
+using System.Text;
+using System.Xml.Serialization;
+using System.Xml;
+
+using static mpvnet.Global;
+
+namespace mpvnet
+{
+    [Serializable()]
+    public class AppSettings
+    {
+        public int LastUpdateCheck;
+        public int Volume = 70;
+        public List<string> RecentFiles = new List<string>();
+        public Point WindowLocation;
+        public Point WindowPosition;
+        public Size WindowSize;
+        public string ConfigEditorSearch = "";
+        public string Mute = "no";
+        public string UpdateCheckVersion = "";
+    }
+
+    class SettingsManager
+    {
+        public static string SettingsFile {
+            get => Core.ConfigFolder + "settings.xml";
+        }
+
+        public static AppSettings Load()
+        {
+            if (!File.Exists(SettingsFile))
+                return new AppSettings();
+
+            XmlSerializer serializer = new XmlSerializer(typeof(AppSettings));
+
+            using (FileStream fs = new FileStream(SettingsFile, FileMode.Open))
+                return (AppSettings)serializer.Deserialize(fs);
+        }
+
+        public static void Save(object obj)
+        {
+            using (XmlTextWriter writer = new XmlTextWriter(SettingsFile, Encoding.UTF8))
+            {
+                writer.Formatting = Formatting.Indented;
+                writer.Indentation = 4;
+                XmlSerializer serializer = new XmlSerializer(obj.GetType());
+                serializer.Serialize(writer, obj);
+            }
+        }
+    }
+}