Style improvements for 0.9.x

[chrisbanes]

This re-introduces a more global way to set styling properties, but this time via a new LocalHazeStyle composition local. As we now have 3 different sources for styling information, we now have documented precedence rules.

Also made the Modifier.Node implementations public, for more custom use cases.

To quickly illustrate all of the ways to set styling properties:

LocalHazeStyle

CompositionLocalProvider(LocalHazeStyle provides fooStyle) {
    Box(
       Modifier.hazeChild(state = hazeState)
    )
}

style on hazeChild

Box(
   Modifier.hazeChild(state = hazeState, style = fooStyle)
)

// or... (these are equivalent)

Box(
    Modifier.hazeChild(state = hazeState) {
        style = fooStyle
    }
)

Individual styling properties

Box(
    Modifier.hazeChild(state = hazeState) {
        tints = listOf(...)
    }
)

Fixes #340