[ntcore] Special-case default timestamps #5003
Merged
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Previously, a setDefault() on the server could override a client doing a real set() if the time offset between client and server was negative, resulting in a negative timestamp from the client. This is a not uncommon situation with robot code, as the robot code always starts at time 0, so any clients that set values earlier (in real time) would have negative timestamps.
Also improve special casing of 0 in the transmit side to make sure a normal timestamp will never get sent as 0.
Fixes #5002.
TODO: