ZRR Output Binding: separate Init from Update

Separated initialisation of ZRR Highcharts-3d-output binding widget ('.riskroom-output') from updating. Initialisation happens in "initRiskRoom.js", while only update now happens in the "room.js" script.

TODO: need to find a way to select the rootElement by parameter (hard set to '.riskroom-output' now).
TODO: add 3d camera movements
TODO: implement what-if
x3dom for zrr.shiny.dev

Library x3d_room.js provides the ZRR visualization by using Shiny Output binding and x3dom framework from Fraunhofer institute.

An even better option probably is to use three.js instead of x3dom.