move CRViz to RxJS 6

[rashley-iqt]

RxJS 6 has discarded operator chaining in favor of operator piping
(for good reason see: https://github.com/ReactiveX/rxjs/blob/91088dae1df097be2370c73300ffa11b27fd0100/doc/pipeable-operators.md for more detail)
needless to say this presents several breaking changes for CRViz in that it breaks ALL of our epics. In the interests of smaller more performant js bundles and objects and eliminating unecessary dependencies we should upgade to RxJS 6.