Silence a noisy log message.
Protect against UART Rx queue growing underneath us.

This fixes a race condition that was causing a hard crash because we
started accessing invalid memory.
Merge remote-tracking branch 'origin/next' into iso
Make sure to init acceptance filter as bypass for passthrough.
Bump openxc-message-format repo (no functional change).
Don't import from namespaces in headers.

Conflicts:
	src/diagnostics.cpp
	src/diagnostics.h
Merge branch 'next' into iso
Send diagnostic message responses out as JSON/PROTO.
Store CAN payload size with Rx'd messages.
Fix check for MPIDE in Cygwin.
Merge branch 'next' into iso
Add missing namespace imports in tests.
Merge branch 'next' into iso
Update testsfor new passthrough function type signature.
Fix initialization of CanMessage struct on PIC32 for Rx.