upgrade helloworld app to 0.3.0
upgrade helloworld-app to use 0.3.0 tooling
upgrade chat-client to 0.3.0 tooling

Only kept aspects that are doable for 0.3.0 - dev + prod
replace old simulated namespaces with v3 ones

also add back UI/simulated aspect
fix simulated messages and message html

* Simulated message immediately fires as it used to.
* Added back message status div and ensured .messages is empty by not initially populating it.