More flexible memory manager (#307)

* Keep track mapped buffers with fixed offsets

* Started rewriting the memory manager

* Initial support for MapPhysicalMemory and UnmapPhysicalMemory, other tweaks

* MapPhysicalMemory/UnmapPhysicalMemory support, other tweaks

* Rebased

* Optimize the map/unmap physical memory svcs

* Integrate shared font support

* Fix address space reserve alignment

* Some fixes related to gpu memory mapping

* Some cleanup

* Only try uploading const buffers that are really used

* Check if memory region is contiguous

* Rebased

* Add missing count increment on IsRegionModified

* Check for reads/writes outside of the address space, optimize translation with a tail call

Ryujinx.HLE/OsHle/Utilities/IntUtils.cs

@@ -11,5 +11,15 @@ namespace Ryujinx.HLE.OsHle.Utilities
         {
             return (Value + (Size - 1)) & ~((long)Size - 1);
         }
+
+        public static int AlignDown(int Value, int Size)
+        {
+            return Value & ~(Size - 1);
+        }
+
+        public static long AlignDown(long Value, int Size)
+        {
+            return Value & ~((long)Size - 1);
+        }
     }
 }