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/FileLogTarget.cs

@@ -0,0 +1,36 @@
+using System.IO;
+using System.Text;
+
+namespace Ryujinx.Common.Logging
+{
+    public class FileLogTarget : ILogTarget
+    {
+        private static readonly ObjectPool<StringBuilder> _stringBuilderPool = SharedPools.Default<StringBuilder>();
+
+        private readonly StreamWriter  _logWriter;
+        private readonly ILogFormatter _formatter;
+
+        public FileLogTarget(string path)
+            : this(path, FileShare.Read, FileMode.Append)
+        { }
+
+        public FileLogTarget(string path, FileShare fileShare, FileMode fileMode)
+        {
+            _logWriter = new StreamWriter(File.Open(path, fileMode, FileAccess.Write, fileShare));
+            _formatter = new DefaultLogFormatter();
+        }
+
+        public void Log(object sender, LogEventArgs args)
+        {
+            _logWriter.WriteLine(_formatter.Format(args));
+            _logWriter.Flush();
+        }
+
+        public void Dispose()
+        {
+            _logWriter.WriteLine("---- End of Log ----");
+            _logWriter.Flush();
+            _logWriter.Dispose();
+        }
+    }
+}