This commit starts the process of merging scope arena
with the diff machine to give the diffing algorithm mutable
access to components. React and Preact mutate the dom
as they diff it which makes their implementations simpler
and cleaner. The goal here is to give access of scopes to
the diffing machine which can mutate the underyling
representation during diffing.
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.
