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/todomvc/todolist.rs

@@ -6,7 +6,7 @@ use crate::{
 };
 use dioxus_core::prelude::*;
 
-pub fn TodoList(ctx: Context, props: &()) -> DomTree {
+pub fn TodoList(ctx: Context<()>) -> VNode {
     let (draft, set_draft) = use_state(&ctx, || "".to_string());
     let (todos, _) = use_state(&ctx, || Vec::<TodoItem>::new());
     let filter = use_atom(&ctx, &FILTER);