Enhance app trust chain

[alexaib2002]

As our app expects only users that have an account registered inside the DB, we shouldn't allow foreign agents to be able to modify the DB or any of its stored data.

We can fix this by enhancing the trust chain, so the top level components of the app (user auth) will be working as expected (only users logged from inside the app will be able to pass through the login screen).

• [Feature] User authentication #11 won't bbe useful at all if any user/process in the OS is allowed to modify any DB table outside the application (ie: With DB Browser, anyone can edit and tamper the users table of the SQLite database, rendering our user authentication methods useless).
• By enforcing a trust chain, we'll have a complete warranty that everything stored inside the DB is and will only be readable and writable by our app.
• This will mean only users accepted by our app will have access to the DB, and their respective role/permissions will be enforced, as they won't be able to execute any SQL command that has not been exposed by the app.

[alexaib2002]

Some links that may be useful:

• https://www.sqlite.org/see/doc/trunk/www/readme.wiki (official docs from SQLite about encryption support)
• https://stackoverflow.com/questions/33363075/how-to-make-encrypted-sqlite3-database-with-nodejs-in-windows-platform (actual question on StackOverflow about electron SQLite encryption support)
• https://github.com/journeyapps/node-sqlcipher (project referenced in the above links)