Move solution and projects to src

src/ARMeilleure/Common/NativeAllocator.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace ARMeilleure.Common
+{
+    unsafe sealed class NativeAllocator : Allocator
+    {
+        public static NativeAllocator Instance { get; } = new();
+
+        public override void* Allocate(ulong size)
+        {
+            void* result = (void*)Marshal.AllocHGlobal((IntPtr)size);
+
+            if (result == null)
+            {
+                throw new OutOfMemoryException();
+            }
+
+            return result;
+        }
+
+        public override void Free(void* block)
+        {
+            Marshal.FreeHGlobal((IntPtr)block);
+        }
+    }
+}