Binary vehicle log

Replace .vlog format vehicle event logs with a binary format .veb

Each event is 8 bytes:

* 4: time-of-day stamp (ms) 0 - 86,400,000; unknown 0xFFFFFFFF
* 2: duration (ms) 1 - 60,000; unknown 0xFFFF
* 1: speed (kph) 5 - 200; unknown 0xFF
* 1: length (dm) 5 - 255; unknown 0

A gap in sampling is represented by this record: 0xFFFFFFFF, 0, 0, 0
