Support HomeBrew Loader (#577)

* Make it possibles to load hb-loader and hb-menu

One issue remains with hb-menu homebrew icons because of SIMD issues
(libjpeg-turbo related) and netloader doesn't work.

* Implement GetApplicationControlData

* Fix shared fonts for NSO/NRO

* Add homebrew NRO romfs support

This readd the NRO support by parsing the ASET header

* Address comments about HomebrewRomFs

* override Dispose in homebrew romfs stream

* Use a struct for file timestamp

* Simplify positional increments in GetApplicationControlData

* Address comments

* improve readability of the memory permission check in SetProcessMemoryPermission

* Fix previous broken check

* Add address space checks in SetProcessMemoryPermission

Ryujinx.HLE/HOS/Services/Pm/IShellInterface.cs

@@ -0,0 +1,34 @@
+using Ryujinx.HLE.HOS.Ipc;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Ryujinx.HLE.HOS.Services.Pm
+{
+    class IShellInterface : IpcService
+    {
+        private Dictionary<int, ServiceProcessRequest> _commands;
+
+        public override IReadOnlyDictionary<int, ServiceProcessRequest> Commands => _commands;
+
+        public IShellInterface()
+        {
+            _commands = new Dictionary<int, ServiceProcessRequest>
+            {
+                { 6, GetApplicationPid }
+            };
+        }
+
+        // GetApplicationPid() -> u64
+        public long GetApplicationPid(ServiceCtx context)
+        {
+            // FIXME: This is wrong but needed to make hb loader works
+            // TODO: Change this when we will have a way to process via a PM like interface.
+            long pid = context.Process.Pid;
+
+            context.ResponseData.Write(pid);
+
+            return 0;
+        }
+    }
+}