begin transmusicales demo
remove threejs dependency
static data for transmusicales venue
upgrade xml3d to latest development build
busy indicator using xml3d's complete property
busy indicator, cleanup

* use new busy indicator for all examples
* remove deprecated xml3d version
bugfix for new asset syntax
transmusicales pois added
additional poi types

* tetrahedron with icon (adapted texture space)
* texture clamp to transparency for overlay shader
* color update mechanism
debug

* remove buildings
* enable mouse controller