Noticket: [factorio_manager.sh] Added commands for renaming and resetting the server map:

- Bumped the version as well.
- Added check for validating that a directory contains a server
instance.
- Minor cleanup of an extra blank line and variable assignment.

Noticket: [factorio_manager.sh] Disable checks for concurrent reading/writing to a lock file:

- Warnings will still trigger for 200>"$lock_file" lines, but
currently it does not seem possible to disable the check for those
lines only - unless the check is disabled for the entire subshell.