Misc cleanup (#708)

* Fix typos

* Remove unneeded using statements

* Enforce var style more

* Remove redundant qualifiers

* Fix some indentation

* Disable naming warnings on files with external enum names

* Fix build

* Mass find & replace for comments with no spacing

* Standardize todo capitalization and for/if spacing

Ryujinx.HLE/Exceptions/ServiceNotImplementedException.cs

@@ -1,10 +1,8 @@
 using Ryujinx.Common;
 using Ryujinx.HLE.HOS;
 using Ryujinx.HLE.HOS.Ipc;
-using Ryujinx.HLE.HOS.Kernel.Ipc;
 using Ryujinx.HLE.HOS.Services;
 using System;
-using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Reflection;