Fix error with `serve(...)` when no routes are added

Release 11.0.0

This includes the following new features and changes:
- PHP 8+ requirement
- new middleware support via `apply(...)` and `route(...)`
- named parameter bindings via `bind(...)`
- request-context store via `stash(...)`
- remove `page(...)` as it didn't have the flexibility required
- add `_404(...)` for custom http 404 handlers

refactor routing

fix 404 handling, improve PHP 7.x compatiblity

Remove match() function

remove call to flush()

response() returns callable

update to pico2

move base functionality to pico

v10.0, moved to noodlehaus/dispatch