Validation Project v2 (#444)

Refactor of the Validation System for more ease of use in the future.
The project now builds a standalone executable and executes it before
the main project is built or published.
Since it is now a standalone executable we are also able to use .NET
Core features as we are no longer locked to netstandard.

The project currently includes 1 task, LocalesValidationTask, that will
check if the locales.json file has any of the following issues:
The json is invalid.
The json has locales with missing languages.
The json has locales with langauges that are just duplicates of the
en_US field.

If the project is built or published locally it will also fix any
missing languages or duplicate fields.

---------

Co-authored-by: Evan Husted <gr33m11@gmail.com>
Co-authored-by: Evan Husted <greem@greemdev.net>

src/Ryujinx.BuildValidationTasks/Program.cs

@@ -0,0 +1,37 @@
+using System;
+using System.IO;
+using System.Linq;
+
+namespace Ryujinx.BuildValidationTasks
+{
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            // Display the number of command line arguments.
+            if (args.Length == 0)
+                throw new ArgumentException("Error: too few arguments!");
+
+            string path = args[0];
+
+            if (string.IsNullOrEmpty(path))
+                throw new ArgumentException("Error: path is null or empty!");
+
+            if (!Path.Exists(path))
+                throw new FileLoadException($"path {{{path}}} does not exist!");
+
+            path = Path.GetFullPath(path);
+
+            if (!Directory.GetDirectories(path).Contains($"{path}src"))
+                throw new FileLoadException($"path {{{path}}} is not a valid ryujinx project!");
+
+            bool isGitRunner = path.Contains("runner") || path.Contains("D:\\a\\Ryujinx\\Ryujinx");
+            if (isGitRunner)
+                Console.WriteLine("Is Git Runner!");
+
+            // Run tasks
+            // Pass extra info needed in the task constructors
+            new LocalesValidationTask().Execute(path, isGitRunner);
+        }
+    }
+}