Security of stored data

[SergioRibera]

The data is currently saved in a binary but this is easily readable as you can see in the image

Therefore, it is necessary to add a feature that encrypts the saved data and decrypts it when loading it. This must have good performance since the writes to this file are recurring to ensure that all the data is preserved.

It's probably also good to make better code for the data saving and loading system.