Add methods to select / deselect by predicate

[zk-phi]

Hi, thank you for developing the cool package.

This PR adds two methods: selectItemsByPredicate and deselectItemsByPredicate to control selection from js interface (not by user manipulation). This may be useful to implement "selected by default" for example (#84).

I'm not sure that the interface is excellent (selectItems (items: Array<TSelectableItem>) might be another option I think) but anyways this kind of feature is nice to have IMO.

Thank you.

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[heri16]

Looks like a very nice feature. Wonder why the delay in merging.