Utils: Improve and correct filter/clone

[loriopatrick]

This commit addresses performance issues in Utils.filterObject. When
filtering objects of moderate size the old logic would hang the program
for multiple seconds. Also adds support for filtering objects in arrays
and handling more complex references.

[kattrali]

Thanks for the contribution, @loriopatrick! 🎉 Looks good so far, though I'll need a bit of time to get through it thoroughly.

[loriopatrick]

@kattrali any progress on this?

[kattrali]

@loriopatrick got a little bogged down with other stuff, I'll have an update shortly.

[loriopatrick]

Thanks