Pass through mouse events where they actually match the corresponding
`Container`. Adopt mouse event accordingly in `Scrollable` `Element`
trait when passing through the mouse event to the scrollable
`Container`.
However this is only working for the same size as the parent container
(i.e. same `Size`). The `.resize` event for the `Container` of the
scrollable element needs to be the necessary and/or required size for
the contents (regardless of the screen viewport).
Remove examples, add description for design goals in README.md and
apply re-names and naming changes accordingly for the project structure.
Implement a flat hierachry, as the library shall remain pretty simple.
