Clicking somewhere else should deselect a tool

Right now when you click a tool, there is no way to deselect it. The way iD does it is to press escape. But maybe even just clicking off somewhere would deselect or do we need a pointer tool?

What do you guys think @dereklieu @drewbo ?

The issue does not identify files or tests; start by running the GUI and tracing where clicking a tool changes the current selection. Confirm whether Escape, clicking elsewhere, or a pointer tool is intended, then verify that the chosen interaction deselects the active tool.

Written by the indexing model from the issue text.