Add Logs tab, log file and fix misc bugs

Add a Logs tab (it logs from the frontend)
Add a log file being created with each packed in case the user doesn't save to CSV (creates dir ~/.gcs and there place the files)
Add fixed decimal formatting when saving to CSV (for both Save to CSV by under and the automatic backup)
Fix the GPS map marker not working in the release version
Add Telemetry On/Off buttons to Commands tab
Add headers to the saved flight data files as per mission guide
Update the README with new screenshots
Up the version to 0.1.0

PWr-Aerospace / ground-control-station