secure memory allocator

We have hosted the application secure memory allocator in order to run this application in our online workstations with Wine or directly.

Quick description about secure memory allocator:

## Overview

`secure_alloc` provides a tiny, **portable**, **thread?safe** memory allocator designed for security?critical applications (e.g., cryptographic libraries, password managers). It offers:

* Page?aligned allocations with a **guard page** to catch overruns.
* Automatic **zero?fill on allocation** and **secure wipe on free**.
* Simple C11 API (`sa_malloc`, `sa_realloc`, `sa_free`).
* Minimal dependencies � only the standard C library and OS APIs.


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