Places: Enable terrain mode to display the satellite, outdoor and topography maps in 3D

[lastzero]

As a mountain lover, I would like to view maps with terrain data in 3D (click on the terrain button on the right side and then use both fingers or mouse buttons to change the perspective):

Note that the functionality as such is freely available, but we currently only have commercial terrain data available to enable the 3D view. We therefore welcome contributions so that we can later offer this to all users, e.g. in combination with our new high-resolution vector map.