[WIP] JSX support

[Jomik]

Fixes #75

Expose a jsxFactory function.
Requires the following compileOptions in tsconfig:

"compilerOptions": {
  "jsx": "react",
  "jsxFactory": "createElement"
}

as well as importing createElement from turbine.

Allow specifying output as a property of the component in JSX.

  <div>
    Counter {count}
    <button output={{ incrementClick: "click" }}>+</button>
    <button output={{ decrementClick: "click" }}>-</button>
  </div>

[codecov]

Codecov Report

Merging #76 into master will decrease coverage by 1.81%.
The diff coverage is 25%.

Impacted Files	Coverage Δ
src/elements.ts	96.39% <ø> (ø)	⬆️
src/index.ts	100% <100%> (ø)	⬆️
src/jsx.ts	20% <20%> (ø)