Tools menu structure

This PR

- restructures the tools menu in order to make it more user friendly, as it eliminates the number of clicks the user has to perform in order to access a function. The structure is now flat.

- creates the ability to start the Object Information routine at any time by cltr-dragging a rectangle on the map.

- Puts the Object Information tree in its dedicated popup window (taken out of tools menu, but it can still be started from the tools menu)

This has been discussed with @davidoesch and @cedricmoullet.