Add PostBuild action to restore Version.cs as empty string (so that it doesnt pollute version control with current build time stamp). #GITBUILD test

merged code from @SixParQuatre:
- Add option in settings/general to use alpha release note sites and use it in Tools.OpenReleaseNotes. As 6000 version changelog don't appear on the alpha site always use GetUnityReleaseNotes in that case.
- When using the alpha sites, we use it in comparison mode with the closest previous installed version. if none is found, use the same version as queried
- Added an extra parameter in Tools.FindNearestVersion to find the nearest below rather than above. Default value is false to maintain existing behaviour in existing calls.

Author: unitycoder

UnityLauncherPro/MainWindow.xaml

@@ -790,16 +790,14 @@
                                     <CheckBox  x:Name="chkQuitAfterOpen" Content="Close after opening project"  Checked="ChkQuitAfterOpen_CheckedChanged" Unchecked="ChkQuitAfterOpen_CheckedChanged" ToolTip="Closes launcher after running project (not really useful)" HorizontalAlignment="Left"/>
                                     <CheckBox  x:Name="chkQuitAfterCommandline" Content="Close after launching from Explorer"  Unchecked="ChkQuitAfterCommandline_CheckedChanged" Checked="ChkQuitAfterCommandline_CheckedChanged" ToolTip="Close launcher after running from commandline or Explorer (recommended)" HorizontalAlignment="Left"/>
                                     <CheckBox  x:Name="chkAllowSingleInstanceOnly" Content="Allow single instance only"  Checked="ChkAllowSingleInstanceOnly_CheckedChanged" Unchecked="ChkAllowSingleInstanceOnly_CheckedChanged" ToolTip="Activates already running instance, instead of starting new exe (not working if app is minized to taskbar)" HorizontalAlignment="Left"/>
+                                    <CheckBox x:Name="useAlphaReleaseNotesSite" Content="Use Unity Alpha Release Notes Site (Unity 6 not supported)"  ToolTip="Use the superior (but alpha) Unity Release Notes (https://alpha.release-notes.ds.unity3d.com/) site when clicking on the ReleaseNotes button. Otherwise will default to the normal build page." Checked="UseAlphaReleaseNotes_Checked" Unchecked="UseAlphaReleaseNotes_Checked"/>
                                     <CheckBox x:Name="chkStreamerMode" Content="Streamer Mode (hide project names and folders)"  ToolTip="Hide project names and folders in main view" Checked="ChkStreamerMode_Checked" Unchecked="ChkStreamerMode_Checked" HorizontalAlignment="Left"/>
-
                                     <!--<StackPanel Orientation="Horizontal" Margin="0,0,0,4">
                                 <TextBox x:Name="txtTemplatePackagesFolder" BorderBrush="Transparent" CaretBrush="{DynamicResource ThemeSearchCaret}" Background="{DynamicResource ThemeTextBoxBackground}" SelectionBrush="{DynamicResource ThemeSearchSelection}" Foreground="{DynamicResource ThemeSearchForeground}" ToolTip="Folder for your custom unitypackage templates (for new project)" Padding="0,3,0,0" Width="110" TextChanged="TxtTemplatePackagesFolder_TextChanged" />
                                 <Button Style="{StaticResource CustomButton}" x:Name="btnBrowseTemplateUnityPackagesFolder" Content="..." Margin="6,0,0,0" MinWidth="22" MinHeight="22" FontSize="16" ToolTip="Browse for new projects root folder.." Click="BtnBrowseTemplateUnityPackagesFolder_Click" />
                                 <Label Content="UnityPackage Templates Folder" Foreground="{DynamicResource ThemeButtonForeground}" />
                             </StackPanel>-->
 
-
-
                                 </StackPanel>
                             </GroupBox>
 

UnityLauncherPro/MainWindow.xaml.cs

@@ -416,6 +416,7 @@ void LoadSettings()
                 txtRootFolderForNewProjects.Text = Properties.Settings.Default.newProjectsRoot;
                 txtWebglRelativePath.Text = Properties.Settings.Default.webglBuildPath;
                 txtCustomThemeFile.Text = Properties.Settings.Default.themeFile;
+                useAlphaReleaseNotesSite.IsChecked = Properties.Settings.Default.useAlphaReleaseNotes;
 
                 chkEnablePlatformSelection.IsChecked = Properties.Settings.Default.enablePlatformSelection;
                 chkRunAutomatically.IsChecked = Properties.Settings.Default.runAutomatically;
@@ -3623,6 +3624,14 @@ private void btnOpenEditorLogsFolder_PreviewMouseDown(object sender, MouseButton
             }
         }
 
+        private void UseAlphaReleaseNotes_Checked(object sender, RoutedEventArgs e)
+        {
+            var isChecked = (bool)((CheckBox)sender).IsChecked;
+
+            Settings.Default.useAlphaReleaseNotes = isChecked;
+            Settings.Default.Save();
+        }
+
         //private void menuProjectProperties_Click(object sender, RoutedEventArgs e)
         //{
         //    var proj = GetSelectedProject();