DIY firmware tool safety checks

[ButterscotchV]

DIY Firmware tool has 4 massive problems right now:

• There's no warning or mention at all of the fact that you can absolutely brick your trackers by configuring it wrong, so people may just think it's fine and mess stuff up
• There's no safeguards whatsoever for official trackers, specifically at least automatically warning for v1.0-v1.1 vs v1.2 trackers, despite the fact that we can easily differentiate them in software
• The firmware version list starts with the oldest one first, so people end up selecting firmware v0.7.1 despite v0.7.2 also being listed below (Fix version sorting for DIY firmware tool #1803)
• Only trackers that have fully connected show up, so in the case that a tracker does get configured incorrectly, it won't be able to be re-flashed using the DIY tool and you must go to the more manual OTA tool or USB flashing to recover it