Some minor fixes and improvements.
- [Improvement] Now add-to-wildcard, tools-site and default-site ask for data if not entered.
- [Improvement] Now we ask if you want to install a package (if not installed) instead of just displaying an error.
- [Improvement] Unattended sites creation now exits instead of asking for data.
- [Improvement] New internal functions and code refactored.
- [Improvement] Delete-All sites now ask before proceed.
- [Improvement] Better exit codes in case of an error.
- [Improvement] Removed support for legacy stats API.
- [Fixed] Orphan files are now removed after purge-server-all.
- [Fixed] Source folder failing after reinstalling.