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/LocalesValidationTask.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.IO;
+using System.Text.Json;
+using System.Text.Encodings.Web;
+
+namespace Ryujinx.BuildValidationTasks
+{
+    public class LocalesValidationTask : ValidationTask
+    {
+        public LocalesValidationTask() { }
+
+        public bool Execute(string projectPath, bool isGitRunner)
+        {
+            Console.WriteLine("Running Locale Validation Task...");
+
+            string path = projectPath + "src/Ryujinx/Assets/locales.json";
+            string data;
+
+            using (StreamReader sr = new(path))
+            {
+                data = sr.ReadToEnd();
+            }
+
+            LocalesJson json;
+
+            if (isGitRunner && data.Contains("\r\n"))
+                throw new FormatException("locales.json is using CRLF line endings! It should be using LF line endings, build locally to fix...");
+
+            try
+            {
+                json = JsonSerializer.Deserialize<LocalesJson>(data);
+
+            }
+            catch (JsonException e)
+            {
+                throw new JsonException(e.Message); //shorter and easier stacktrace
+            }
+
+
+
+            bool encounteredIssue = false;
+
+            for (int i = 0; i < json.Locales.Count; i++)
+            {
+                LocalesEntry locale = json.Locales[i];
+
+                foreach (string langCode in json.Languages.Where(lang => !locale.Translations.ContainsKey(lang)))
+                {
+                    encounteredIssue = true;
+
+                    if (!isGitRunner)
+                    {
+                        locale.Translations.Add(langCode, string.Empty);
+                        Console.WriteLine($"Added '{langCode}' to Locale '{locale.ID}'");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"Missing '{langCode}' in Locale '{locale.ID}'!");
+                    }
+                }
+
+                foreach (string langCode in json.Languages.Where(lang => locale.Translations.ContainsKey(lang) && lang != "en_US" && locale.Translations[lang] == locale.Translations["en_US"]))
+                {
+                    encounteredIssue = true;
+
+                    if (!isGitRunner)
+                    {
+                        locale.Translations[langCode] = string.Empty;
+                        Console.WriteLine($"Lanugage '{langCode}' is a duplicate of en_US in Locale '{locale.ID}'! Resetting it...");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"Lanugage '{langCode}' is a duplicate of en_US in Locale '{locale.ID}'!");
+                    }
+                }
+
+                locale.Translations = locale.Translations.OrderBy(pair => pair.Key).ToDictionary(pair => pair.Key, pair => pair.Value);
+                json.Locales[i] = locale;
+            }
+
+            if (isGitRunner && encounteredIssue)
+                throw new JsonException("1 or more locales are invalid!");
+
+            JsonSerializerOptions jsonOptions = new JsonSerializerOptions()
+            {
+                WriteIndented = true,
+                NewLine = "\n",
+                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
+            };
+
+            string jsonString = JsonSerializer.Serialize(json, jsonOptions);
+
+            using (StreamWriter sw = new(path))
+            {
+                sw.Write(jsonString);
+            }
+
+            Console.WriteLine("Finished Locale Validation Task!");
+
+            return true;
+        }
+
+        struct LocalesJson
+        {
+            public List<string> Languages { get; set; }
+            public List<LocalesEntry> Locales { get; set; }
+        }
+
+        struct LocalesEntry
+        {
+            public string ID { get; set; }
+            public Dictionary<string, string> Translations { get; set; }
+        }
+    }
+}