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/Handles/IMemoryHandle.cs

@@ -0,0 +1,27 @@
+using UnmanagedMMU.Allocators;
+
+namespace UnmanagedMMU.Handles
+{
+
+    /// <summary>
+    /// Interface that represents an untyped handle to unmanaged memory.
+    /// </summary>
+    public unsafe interface IMemoryHandle
+    {
+
+        /// <summary>
+        /// Gets the raw pointer to the underlying unmanaged memory block.
+        /// </summary>
+        /// <remarks>
+        /// The returned pointer is valid only for the lifetime of the allocator
+        /// that created this <see cref="IMemoryHandle"/>.
+        /// </remarks>
+        void* Pointer { get; }
+
+        /// <summary>
+        /// Gets the number of bytes in the unmanaged memory block
+        /// represented by this <see cref="IMemoryHandle"/>.
+        /// </summary>
+        nuint ByteCount { get; }
+    }
+}