Refactoring. Move system plugins to seperate DLLs.

Plugins/Wox.Plugin.Program/ProgramSuffixes.xaml.cs

@@ -0,0 +1,30 @@
+using System.Windows;
+using Wox.Infrastructure.Storage.UserSettings;
+
+namespace Wox.Plugin.Program
+{
+    /// <summary>
+    /// ProgramSuffixes.xaml 的交互逻辑
+    /// </summary>
+    public partial class ProgramSuffixes
+    {
+        public ProgramSuffixes()
+        {
+            InitializeComponent();
+
+            tbSuffixes.Text = UserSettingStorage.Instance.ProgramSuffixes;
+        }
+
+        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
+        {
+            if (string.IsNullOrEmpty(tbSuffixes.Text))
+            {
+                MessageBox.Show("File suffixes can't be empty");
+                return;
+            }
+
+            UserSettingStorage.Instance.ProgramSuffixes = tbSuffixes.Text;
+            MessageBox.Show("Sucessfully update file suffixes");
+        }
+    }
+}