Implement mii:u and mii:e entirely (#955)

* Implement mii:u and mii:e entirely

Co-authored-by: AcK77 <Acoustik666@gmail.com>

This commit implement the mii service accurately.

This is based on Ac_k work but was polished and updated to 7.x.

Please note that the following calls are partially implemented:

- Convert: Used to convert from old console format (Wii/Wii U/3ds)
- Import and Export: this is shouldn't be accesible in production mode.

* Remove some debug leftovers

* Make it possible to load an arbitrary mii database from a Switch

* Address gdk's comments

* Reduce visibility of all the Mii code

* Address Ac_K's comments

* Remove the StructLayout of DatabaseSessionMetadata

* Add a missing line return in DatabaseSessionMetadata

* Misc fixes and style changes

* Fix some issues from last commit

* Fix database server metadata UpdateCounter in MarkDirty (Thanks Moose for the catch)

* MountCounter should only be incremented when no error is reported

* Fix FixDatabase

Co-authored-by: Alex Barney <thealexbarney@gmail.com>

Ryujinx.HLE/HOS/Services/Mii/UtilityImpl.cs

@@ -0,0 +1,67 @@
+using Ryujinx.HLE.HOS.Services.Mii.Types;
+using Ryujinx.HLE.HOS.Services.Time;
+using Ryujinx.HLE.HOS.Services.Time.Clock;
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Mii
+{
+    class UtilityImpl
+    {
+        private uint _x;
+        private uint _y;
+        private uint _z;
+        private uint _w;
+
+        public UtilityImpl()
+        {
+            _x = 123456789;
+            _y = 362436069;
+
+            TimeSpanType time = TimeManager.Instance.TickBasedSteadyClock.GetCurrentRawTimePoint(null);
+
+            _w = (uint)(time.NanoSeconds & uint.MaxValue);
+            _z = (uint)((time.NanoSeconds >> 32) & uint.MaxValue);
+        }
+
+        private uint GetRandom()
+        {
+            uint t = (_x ^ (_x << 11));
+
+            _x = _y;
+            _y = _z;
+            _z = _w;
+            _w = (_w ^ (_w >> 19)) ^ (t ^ (t >> 8));
+
+            return _w;
+        }
+
+        public int GetRandom(int end)
+        {
+            return (int)GetRandom((uint)end);
+        }
+
+        public uint GetRandom(uint end)
+        {
+            uint random = GetRandom();
+
+            return random - random / end * end;
+        }
+
+        public uint GetRandom(uint start, uint end)
+        {
+            uint random = GetRandom();
+
+            return random - random / (1 - start + end) * (1 - start + end) + start;
+        }
+
+        public int GetRandom(int start, int end)
+        {
+            return (int)GetRandom((uint)start, (uint)end);
+        }
+
+        public CreateId MakeCreateId()
+        {
+            return new CreateId(Guid.NewGuid().ToByteArray());
+        }
+    }
+}