Logger and Configuration Refactoring (#573)

* Logging: Refactor log targets into Ryujinx.Common

* Logger: Implement JSON Log Target

* Logger: Optimize Console/File logging targets

Implement a simple ObjectPool to pool up StringBuilders to avoid causing excessive GCing of gen1/2 items when large amounts of log entries are being generated.

We can also pre-determine the async overflow action at initialization time, allowing for an easy optimization in the message enqueue function, avoiding a number of comparisons.

* Logger: Implement LogFormatters

* Config: Refactor configuration file and loading

* Config: Rename to .jsonc to avoid highlighting issues in VSC and GitHub

* Resolve style nits

* Config: Resolve incorrect default key binding

* Config: Also update key binding default in schema

* Tidy up namespace imports

* Config: Update CONFIG.md to reflect new Config file

Ryujinx.Common/Logging/Targets/ConsoleLogTarget.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Concurrent;
+
+namespace Ryujinx.Common.Logging
+{
+    public class ConsoleLogTarget : ILogTarget
+    {
+        private static readonly ConcurrentDictionary<LogLevel, ConsoleColor> _logColors;
+
+        private readonly ILogFormatter _formatter;
+
+        static ConsoleLogTarget()
+        {
+            _logColors = new ConcurrentDictionary<LogLevel, ConsoleColor> {
+                [ LogLevel.Stub    ] = ConsoleColor.DarkGray,
+                [ LogLevel.Info    ] = ConsoleColor.White,
+                [ LogLevel.Warning ] = ConsoleColor.Yellow,
+                [ LogLevel.Error   ] = ConsoleColor.Red
+            };
+        }
+
+        public ConsoleLogTarget()
+        {
+            _formatter = new DefaultLogFormatter();
+        }
+
+        public void Log(object sender, LogEventArgs args)
+        {
+            if (_logColors.TryGetValue(args.Level, out ConsoleColor color))
+            {
+                Console.ForegroundColor = color;
+
+                Console.WriteLine(_formatter.Format(args));
+
+                Console.ResetColor();
+            }
+            else
+            {
+                Console.WriteLine(_formatter.Format(args));
+            }
+        }
+
+        public void Dispose()
+        {
+            Console.ResetColor();
+        }
+    }
+}