ITimeZoneService rewrite (#722)

* Clean up ITimeZoneService

Add error codes and simplify parsing

* Add accurate timezone logic

TOOD: LoadTimeZoneRule and location name cmds.

* Integrate the new TimeZone logic

* SCREAMING_UNIX_CASE => PascalCase

* Address comments

* Reduce use of pointer in the LoadTimeZoneRule logic

* Address comments

* Realign tzIfStream logic in LoadTimeZoneRule

* Address gdk's comments

Ryujinx.HLE/Utilities/StreamUtils.cs

@@ -0,0 +1,16 @@
+using System.IO;
+
+namespace Ryujinx.HLE.Utilities
+{
+    static class StreamUtils
+    {
+        public static byte[] StreamToBytes(Stream input)
+        {
+            using (MemoryStream ms = new MemoryStream())
+            {
+                input.CopyTo(ms);
+                return ms.ToArray();
+            }
+        }
+    }
+}