React init aligns with runtime init

[andrejewski]

Building out raj-spa I ran into the problem of raj/runtime not accepting an init function. Or to put it another way, I ran into the problem of raj/react using an init function. Both make sense in their own ways but for the community at large the difference is a huge pain. My goal has always been to have the runtime and React runtime apps be aligned so that they can benefit, within reason, from the same ecosystem.

The solution was to lift the init(props) up one more layer. Which I think is the best move because in every app I have made with Raj I have only needed React (and thus props) at the root, once per app. So adding one more closure at the root is the best solution ergonomically. I also look forward to writing const init = [model, effect] as the function wrapper I always felt was verbose.