Updated the SegmentedPool to allow for zeroing of allocations and for returning a pointer to allocated memory to allow for use in unsafe structs (#2)

UnmangedMMU/Allocators/IUnmanagedMemoryOwner.cs

@@ -0,0 +1,16 @@
+
+using UnmanagedMMU.Handles.Internal;
+
+namespace UnmanagedMMU.Allocators
+{
+    /// <summary>
+    /// Interface that defines a mechanisim for the owner of an unmanaged memory allocation
+    /// </summary>
+    internal interface IUnmanagedMemoryOwner
+    {
+        /// <summary>
+        /// Frees the allocated memory represented by <paramref name="handle"/> back to the owning <see cref="IUnmanagedMemoryOwner"/> instance
+        /// </summary>
+        void Free(IOwnedHandle handle);
+    }
+}