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.

notes/CHANGELOG.md

@@ -113,11 +113,12 @@ Welcome to the first iteration of the Dioxus Virtual DOM! This release brings su
   - [ ] Re-exported through the `dioxus` crate (not core)
 - [ ] Hooks
   - [ ] Re-exported through the `dioxus` crate (not essential to core virtualdom)
+- [ ] fragments
+- [ ] pass-thru components
 
 ## Less-essential todos
 
 - [ ] HTML doesn't require strings between elements (copy-paste from internet)
-- [ ] Make events lazy (use traits + Box<dyn>) - not sure what this means anymore
 - [ ] Beef up the dioxus CLI tool to report build progress
 - [ ] Extract arena logic out for better safety guarantees
 - [ ] Extract BumpFrame logic out for better safety guarantees
@@ -130,8 +131,7 @@ Welcome to the first iteration of the Dioxus Virtual DOM! This release brings su
 
 lower priority features
 
-- [ ] Attributes on elements should implement format_args instead of string fmt
-- [ ] fragments
+- [x] Attributes on elements should implement format_args instead of string fmt
 - [ ] node refs (postpone for future release?)
 - [ ] styling built-in (future release?)
 - [ ] key handler?