scripts: Added basic live tracking analysis script

Only counting the number of live tracking fixes for now
scripts: Added get_base_query() to tracking/stats.py
scripts: Show tracking sessions in tracking/stats.py
scripts: Added JSON output to tracking/stats.py
scripts: Count session fixes and print duration in tracking/stats.py
scripts: Added quality and dt output to tracking/stats.py
scripts: Fixed tracking/stats.py for empty lists
scripts: Added print_session() to tracking/stats.py
Merge pull request #135 from Turbo87/tracking-stats

Tracking stats