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/IdDictionary.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+
+namespace Ryujinx.HLE.HOS
+{
+    class IdDictionary
+    {
+        private ConcurrentDictionary<int, object> Objs;
+
+        public IdDictionary()
+        {
+            Objs = new ConcurrentDictionary<int, object>();
+        }
+
+        public bool Add(int Id, object Data)
+        {
+            return Objs.TryAdd(Id, Data);
+        }
+
+        public int Add(object Data)
+        {
+            for (int Id = 1; Id < int.MaxValue; Id++)
+            {
+                if (Objs.TryAdd(Id, Data))
+                {
+                    return Id;
+                }
+            }
+
+            throw new InvalidOperationException();
+        }
+
+        public object GetData(int Id)
+        {
+            if (Objs.TryGetValue(Id, out object Data))
+            {
+                return Data;
+            }
+
+            return null;
+        }
+
+        public T GetData<T>(int Id)
+        {
+            if (Objs.TryGetValue(Id, out object Data) && Data is T)
+            {
+                return (T)Data;
+            }
+
+            return default(T);
+        }
+
+        public object Delete(int Id)
+        {
+            if (Objs.TryRemove(Id, out object Obj))
+            {
+                return Obj;
+            }
+
+            return null;
+        }
+
+        public ICollection<object> Clear()
+        {
+            ICollection<object> Values = Objs.Values;
+
+            Objs.Clear();
+
+            return Values;
+        }
+    }
+}