Feat: massive changes to definition of components

This change switches back to the original `ctx<props>` syntax for
commponents. This lets lifetime elision to remove the need to match
exactly which lifetime (props or ctx) gets  carried to the output. As
such, `Props` is currently required to be static. It *is* possible to
loosen this restriction, and will be done in the future, though only
through adding metadata about the props through the Props derive
macro. Implementing the IS_STATIC trait is unsafe, so the derive macro
will do it through some heuristics.

For now, this unlocks sharing vnodes from parents to children, enabling
pass-thru components, fragments, portals, etc.

packages/web/examples/hello.rs

@@ -9,7 +9,7 @@ fn main() {
     wasm_bindgen_futures::spawn_local(WebsysRenderer::start(Example));
 }
 
-static Example: FC<()> = |ctx, _props| {
+static Example: FC<()> = |ctx| {
     ctx.render(rsx! {
         div {
             span {