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/derive.rs

@@ -8,7 +8,7 @@ fn main() {
     wasm_bindgen_futures::spawn_local(WebsysRenderer::start(App));
 }
 
-fn App(ctx: Context, props: &()) -> DomTree {
+fn App(ctx: Context<()>) -> VNode {
     let cansee = use_state_new(&ctx, || false);
     rsx! { in ctx,
         div {
@@ -22,7 +22,7 @@ fn App(ctx: Context, props: &()) -> DomTree {
     }
 }
 
-fn Child(ctx: Context, props: &()) -> DomTree {
+fn Child(ctx: Context<()>) -> VNode {
     rsx! { in ctx,
         section { class: "py-6 bg-coolGray-100 text-coolGray-900"
             div { class: "container mx-auto flex flex-col items-center justify-center p-4 space-y-8 md:p-10 md:px-24 xl:px-48"