Move to observable model and functional components

[aniketfuryrocks]

I tested out the solid-js observable model quite extensively. My benchmarks show a 20% increase in performance with trees of height 20, 30% reduction in executable size. This model opens the door to functional components.

On the merger of observable branch, the API shall be stabilized.

example

#[gxi::comp]
pub fn Counter(initial: i32, reduce_emoji: State<&'static str>) -> StrongNodeType {
    let counter = State::new(initial);

        return gxi! {
            div [
                h1 ( inner_html = &counter.to_string()[..] ),
                div [
                    button ( on_click = set_state!( counter, *counter += 1), inner_html = "+" ),
                    button ( on_click = set_state!( counter, *counter -= 1), inner_html = &reduce_emoji.to_string()[..] )
                ]
            ]
        };
}

[SamuraiCrow]

Excellent!