Deal with setpoints in samples when switching a dive from CCR to OC

For some dive computers (at least the Shearwater Predator, I haven't
checked if there are others), libdivecomputer used to return setpoint
values in each sample even if the dive computer was in OC mode. Those
setpoint values are redundant and confuse our algorithm that tries to
detect if a dive is OC or CCR. So when manually switching from CCR to
OC we make sure that there are no setpoint values in the samples.

This is a destructive change - if the user switches to OC by mistake and
accepts that change, even when switching back to CCR the setpoint changes
during the dive are lost.

I rewrote the code dealing with the events as it was rather confused.
Looping over the events that way didn't make any sense since
get_next_event() is guaranteed to give you the first (if any) event of the
requested name.

See #826

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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