Type ahead search in Layout/Models, Sequencer, Import Mapper grids

[cybercop23]

Support type ahead in those above grids similar to how you can type ahead when inporting sub models from another model; you can type ahead and find the model to import from.

This will also be very useful along side: #3752

[cybercop23]

Reason why this would be so usefull...
https://youtu.be/qEJbiZ6eCrg?t=64

[ekcom]

Specifically for the Sequencer tab, a search bar at the top of the props list would be helpful to quickly filter results to find particular prop(s) by name.

"Typeahead" jumping to the first item with that sequence of characters could alternatively work.