Alt app installer CLI

• Switch to subprocess, improve compatibility with arm-based systems
• Switch to relative path, fixes hidden logs and downloads

Full Changelog: https://github.com/mjishnu/alt-app-installer-cli/commits/v1.0.1

Alt app installer CLI

• Initial release
• Introduce varies flags for various modes like -h for help, -d for download only mode etc