implement search in trackvis

[NateLanza]

Trrackvis should include a search bar that uses string matching to filter displayed nodes. The visualization of relationships between nodes needs to be sensibly preserved despite many nodes being hidden; possibly a dotted line between nodes with the number of hidden nodes listed? Additionally, the search will have to deal with sideways branching in the tree. I think the most reasonable way to do this will be to only search through parent nodes of the currently selected node.

[kirangadhave]

Trrack should have way to mark searchable keys as part of the search API.

Always search for labels and annotations