Allow to define 3D activity as the default one

[claustres]

Kano always starts in 2D now while an application embedding it as an iframe could only need the 3D activity. While it is possible to switch automatically from 2D to 3D it is not optimal as the 2D activity will be loaded anyway. We should be able to define by configuration that the default activity is the 3D one.

Current possiblity to switch:

postRobot.on('map-ready', async (event) => {
  await postRobot.send(event.source, 'globe'
})

[claustres]

This is actually already possible by editing the router configuration although not really convenient;

postRobot.send(kano, 'setConfiguration', {
  'routes[0].children.home.children.default-home-view.redirect.name': 'globe-activity',
  ...
})