add retain option to SOR filtering

[PablerasBCN]

please add an option so that the discarded points are saved as a different cloud instead of being deleted. Checkbox in UI and something like "retain = 1/0 for command line,

[HeadLess]

please add an option so that the discarded points are saved as a different cloud instead of being deleted. Checkbox in UI and something like "retain = 1/0 for command line,

I'll take a look at this, but i maybe just mark them as noise with classification.

[c3kkos]

Or maybe a flag to store "quality" as scalar field?

In this way manipulation is possible, all the way up by the user's likings