Add ui for user preference selection

Wox/SettingWindow.xaml

@@ -55,6 +55,12 @@
                           Checked="OnAutoStartupChecked" Unchecked="OnAutoStartupUncheck">
                     <TextBlock Text="{DynamicResource autoUpdates}" />
                 </CheckBox>
+                <StackPanel Margin="10" Orientation="Horizontal">
+                    <TextBlock Text="Query Search Precision" />
+                    <ComboBox Margin="10 0 0 0" Width="120"
+                              ItemsSource="{Binding QuerySearchPrecisionStrings}" 
+                              SelectedItem="{Binding Settings.QuerySearchPrecision}" />
+                </StackPanel>
                 <StackPanel Margin="10" Orientation="Horizontal">
                     <TextBlock Text="{DynamicResource lastQueryMode}" />
                     <ComboBox Margin="10 0 0 0" Width="120"

Wox/ViewModel/SettingWindowViewModel.cs

@@ -70,6 +70,20 @@ namespace Wox.ViewModel
             }
         }
 
+        public List<string> QuerySearchPrecisionStrings
+        {
+            get
+            { 
+                var precisionStrings = new List<string>();
+
+                var enumList = Enum.GetValues(typeof(StringMatcher.SearchPrecisionScore)).Cast<StringMatcher.SearchPrecisionScore>().ToList();
+
+                enumList.ForEach(x => precisionStrings.Add(x.ToString()));
+
+                return precisionStrings;
+            }
+        }
+
         private Internationalization _translater => InternationalizationManager.Instance;
         public List<Language> Languages => _translater.LoadAvailableLanguages();
         public IEnumerable<int> MaxResultsRange => Enumerable.Range(2, 16);