v2.0.0

What's new:

1. Cross-platform: Both Linux and Windows versions.
2. Both GUI and console versions:

• GUI: DearImGui
• Console: ncurses for linux and pdcurses for windows.

3. SQLite3 database.
4. Migrated the code to c++.
5. New license: AGPL3

Known issues:

The terminal stays open for the GUI version (see the readme file for further details).