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/AsyncLogTargetWrapper.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Concurrent;
+using System.Threading;
+
+namespace Ryujinx.Common.Logging
+{
+    public enum AsyncLogTargetOverflowAction
+    {
+        /// <summary>
+        /// Block until there's more room in the queue
+        /// </summary>
+        Block = 0,
+
+        /// <summary>
+        /// Discard the overflowing item
+        /// </summary>
+        Discard = 1
+    }
+
+    public class AsyncLogTargetWrapper : ILogTarget
+    {
+        private ILogTarget _target;
+
+        private Thread _messageThread;
+
+        private BlockingCollection<LogEventArgs> _messageQueue;
+
+        private readonly int _overflowTimeout;
+
+        public AsyncLogTargetWrapper(ILogTarget target)
+            : this(target, -1, AsyncLogTargetOverflowAction.Block)
+        { }
+
+        public AsyncLogTargetWrapper(ILogTarget target, int queueLimit, AsyncLogTargetOverflowAction overflowAction)
+        {
+            _target          = target;
+            _messageQueue    = new BlockingCollection<LogEventArgs>(queueLimit);
+            _overflowTimeout = overflowAction == AsyncLogTargetOverflowAction.Block ? -1 : 0;
+
+            _messageThread = new Thread(() => {
+                while (!_messageQueue.IsCompleted)
+                {
+                    try
+                    {
+                        _target.Log(this, _messageQueue.Take());
+                    }
+                    catch (InvalidOperationException)
+                    {
+                        // IOE means that Take() was called on a completed collection.
+                        // Some other thread can call CompleteAdding after we pass the
+                        // IsCompleted check but before we call Take.
+                        // We can simply catch the exception since the loop will break
+                        // on the next iteration.
+                    }
+                }
+            });
+
+            _messageThread.IsBackground = true;
+            _messageThread.Start();
+        }
+
+        public void Log(object sender, LogEventArgs e)
+        {
+            if (!_messageQueue.IsAddingCompleted)
+            {
+                _messageQueue.TryAdd(e, _overflowTimeout);
+            }
+        }
+
+        public void Dispose()
+        {
+            _messageQueue.CompleteAdding();
+            _messageThread.Join();
+        }
+    }
+}