Stable release v6.2.0

[bgallois]

FastTrack version 6.2.0 comes with two major improvements for Windows user:

• FastTrack-Cli is now available natively for Windows.
• 2X speed increase compared to previous FastTrack releases.

FastTrack version 6.2.0 comes with several minor fixes and modifications:

• Fixed tray behavior.
• Fixed closing behavior.
• Fixed start-up message behavior.
• Fixed stdout for the cli on Windows.
• Changed compiler for Windows now using MinGW_64.
• Added FastTrack command line interface for Windows