Remove non events not used by interval

[TApplencourt]

In the default mode, remove the events not used by interval.

• If not, they are passed around and finish to be written to disk with the aggregated events.
• Then, during the replay, with it a file limits.

Of course, this is not a fix for the file limits but just a "cleaning" so that by default we just generate events that we use for the tally / interval.

At term, we should allow user to specify events to enable/disable, and find a real solution for the file limits (smarted use of --source or tree reduction)

[Kerilk]

Shouldn't the interval drop events by default instead? after cl_interval there shouldn't be any OpenCL event left in the trace.

[TApplencourt]

Yeah, I was thinking we could do that, too. We cannot do for interval (as they are chained), but we can do that for aggreg. Or create a new plugins who drop everything who is not interval and put it as the end of the chain of interval.

T the advantage that it may help timeline but if people want the timeline they will it the 2GB of protobuf before the number of file open :)