It should be possible to interact with buildings

[Tim Jenks]

As per the building interactions in the WRLD Unity SDK it should be possible to interact with buildings to:

1. Get a collision point in ECEF / LatLongAlt when picking a building
2. Be provided a 'placement point' on the roof of a building
3. Be able to highlight a building with a particular colour, and clear that highlight
4. Be provided the outline of a particular building

[Jonty Dawson]

These are now supported in wrld.js, see examples:

1. https://wrld3d.com/wrld.js/latest/docs/examples/picking-buildings/
2. https://wrld3d.com/wrld.js/latest/docs/examples/placing-objects-on-buildings/
3. https://wrld3d.com/wrld.js/latest/docs/examples/adding-a-building-highlight/
4. https://wrld3d.com/wrld.js/latest/docs/examples/querying-building-information/