v2.x multi-user support and docker compose support
- Elimination of superfluous files
- Moving read.php file within the project
- Addition of Qrcode class abstraction
- Improvement of bulk download
- General refactoring
- Refactoring database tables
- Added script for upgrading to versions >= 2.0
- NEW: added multi-user support for dynamic/static qrcodes
- Refactoring docker image building
- NEW: added docker-compose support