Document how functional broadcast diag requests are handled.
Add an example of how to use addRecurringRequest for diag.
Update a few old references to signal "handlers" (now decoders).
Add an example of using diagnostics module in command handler.
Change the default platform to FORDBOARD.
Update copyright date.
Document example builds for the firmware.
Add a build example for a vehicle emulator.
Add OBD2 build to release process.