Code style fixes and nits on the HLE project (#355)

* Some style fixes and nits on ITimeZoneService

* Remove some unneeded usings

* Remove the Ryujinx.HLE.OsHle.Handles namespace

* Remove hbmenu automatic load on process exit

* Rename Ns to Device, rename Os to System, rename SystemState to State

* Move Exceptions and Utilities out of OsHle

* Rename OsHle to HOS

* Rename OsHle folder to HOS

* IManagerDisplayService and ISystemDisplayService style fixes

* BsdError shouldn't be public

* Add a empty new line before using static

* Remove unused file

* Some style fixes on NPDM

* Exit gracefully when the application is closed

* Code style fixes on IGeneralService

* Add 0x prefix on values printed as hex

* Small improvements on finalization code

* Move ProcessId and ThreadId out of AThreadState

* Rename VFs to FileSystem

* FsAccessHeader shouldn't be public. Also fix file names casing

* More case changes on NPDM

* Remove unused files

* Move using to the correct place on NPDM

* Use properties on KernelAccessControlMmio

* Address PR feedback

Ryujinx.HLE/Exceptions/GuestBrokeExecutionException.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Ryujinx.HLE.Exceptions
+{
+    public class GuestBrokeExecutionException : Exception
+    {
+        private const string ExMsg = "The guest program broke execution!";
+
+        public GuestBrokeExecutionException() : base(ExMsg) { }
+    }
+}

Ryujinx.HLE/Exceptions/InvalidNpdmException.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace Ryujinx.HLE.Exceptions
+{
+    public class InvalidNpdmException : Exception
+    {
+        public InvalidNpdmException(string ExMsg) : base(ExMsg) { }
+    }
+}

Ryujinx.HLE/Exceptions/UndefinedInstructionException.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace Ryujinx.HLE.Exceptions
+{
+    public class UndefinedInstructionException : Exception
+    {
+        private const string ExMsg = "The instruction at 0x{0:x16} (opcode 0x{1:x8}) is undefined!";
+
+        public UndefinedInstructionException() : base() { }
+
+        public UndefinedInstructionException(long Position, int OpCode) : base(string.Format(ExMsg, Position, OpCode)) { }
+    }
+}