* Fix: startup script was throwing FileNotFoundError

See
https://stackoverflow.com/questions/44557347/why-do-i-get-an-error-when-i-try-to-run-donkeycar-server-using-the-docker-image
for details

* Added datasets folder to start server script to fix bug where training fails without it

* odometer part and example vehicle script

* rename file to match class name

* declare in parts init

* fix output syntax

* bug fix

* attempt to prevent shutdown error

* fix isr arg

* new filename

* add distance to odometer output

* change output path

* clean up the comments