add missing carID field to Player JSON and some commas to JSON in general

ID was mentioned in the PLAYER text, but wasn't actually part of the JSON object.
Additionally, all the JSON objects now have commas where they should be, which makes copy-pasting them into a code editor for testing slightly less error-prone
Merge pull request #1 from T045T/patch-1

add missing carID field to Player JSON and some commas to JSON in general