Add search capability to the Terra Wdio tool window

[picimako]

Summary of scope

To make it easier to find screenshots and specs in the tool window a quicksearch capability should be added just like in the IDE Project View.

Solution details

• Replace the current cell renderer implementation with a NodeRenderer.
• Add TreeSpeedSearch capability to the underlying JTree component.

Out of scope

• N/A

[picimako]

Completed on release branch.