Improving processing of kmz-files

It seem to work on most of the kmz-files that is tested on.
But there are some rendering issues on some walls, and I am not sure it
is caused by this THREE.js or this script
Added some more js buildings

When rendered some walls are missing. I don't know why.
A detail with flythrough

It seem to have been missed in a earlier commit
Added some more obj-buildings

Unfortunately, a light parameter in the mtl-files are set to 0 on all
the new buildings.  So the buildings are all black. Will have to fix
that later