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/basic.rs

@@ -1,4 +1,4 @@
-//! Basic example that renders a simple domtree to the browser.
+//! Basic example that renders a simple VNode to the browser.
 
 use dioxus_core::prelude::*;
 use dioxus_web::*;
@@ -12,7 +12,7 @@ fn main() {
     wasm_bindgen_futures::spawn_local(WebsysRenderer::start(App));
 }
 
-static App: FC<()> = |ctx, _| {
+static App: FC<()> = |ctx| {
     ctx.render(rsx! {
         div {
             h1 {"hello"}
@@ -22,7 +22,7 @@ static App: FC<()> = |ctx, _| {
     })
 };
 
-static C1: FC<()> = |ctx, props| {
+static C1: FC<()> = |ctx| {
     ctx.render(rsx! {
         button {
             "numba 1"
@@ -30,7 +30,7 @@ static C1: FC<()> = |ctx, props| {
     })
 };
 
-static C2: FC<()> = |ctx, props| {
+static C2: FC<()> = |ctx| {
     ctx.render(rsx! {
         button {
             "numba 2"