The `Element::render` function now takes a constraint object. This
allows the parent element to influence how the child is rendered. This
is useful eg. to have elements take up more space than they need to fill
some space.
We also make various changes needed for pretty diffs, such as merging
styles, a new `Filled` type, and some color theming.
We implement a new `Element` trait which allows for more complex output
to be drawn, such as vertical and horizontal stacks.
We adapt `Table` to work within this system.
We refresh the output of `rad patch show` to use these new tools.
cloudhead
Alexis Sellier