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/HOS/Kernel/MemoryPermission.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Ryujinx.HLE.HOS.Kernel
+{
+    [Flags]
+    enum MemoryPermission : byte
+    {
+        None = 0,
+        Mask = 0xff,
+
+        Read    = 1 << 0,
+        Write   = 1 << 1,
+        Execute = 1 << 2,
+
+        ReadAndWrite   = Read | Write,
+        ReadAndExecute = Read | Execute
+    }
+}