Moved SyncProject script out of notForLicensees, tidied it up a bit, added -build and -open commands

Added BuildTarget script that can builds specified targets for a project
Added OpenEditor utility script

[FYI] ben.marsh


#ROBOMERGE-SOURCE: CL 7553441 via CL 7553450 via CL 7568654
#ROBOMERGE-BOT: (v372-7473910)

[CL 7569064 by andrew grant in Main branch]

Engine/Source/Programs/AutomationTool/Scripts/OpenEditor.Automation.cs

@@ -0,0 +1,51 @@
+// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text.RegularExpressions;
+using Tools.DotNETCommon;
+using UnrealBuildTool;
+
+namespace AutomationTool
+{
+
+	[Help("Opens the specified project.")]
+	[Help("project=<QAGame>", "Project to open. Will search current path and paths in ueprojectdirs. If omitted will open vanilla UE4Editor")]
+	class OpenEditor: BuildCommand
+	{
+		// exposed as a property so projects can derive and set this directly
+		public string ProjectName { get; set; }
+
+		public OpenEditor()
+		{
+		}
+		
+		public override ExitCode Execute()
+		{
+			string EditorPath = HostPlatform.Current.GetUE4ExePath("UE4Editor");
+
+			string EditorArgs = "";
+
+			ProjectName = ParseParamValue("project", ProjectName);
+
+			if (!String.IsNullOrEmpty(ProjectName))
+			{
+				FileReference ProjectFile = ProjectUtils.FindProjectFileFromName(ProjectName);
+
+				if (ProjectFile == null)
+				{
+					throw new AutomationException("Unable to find uproject file for {0}", ProjectName);
+				}
+
+				EditorArgs = ProjectFile.FullName;
+			}
+	
+			Run(EditorPath, EditorArgs, null, ERunOptions.NoWaitForExit);
+
+			return ExitCode.Success;
+		}
+	}
+
+}