Make minibuffer a bit less large fonty.
Manage focus more carefully.

Otherwise focus gets hosed if we try to use the minibuffer while already in the
minibuffer.
More minibuffer tweaking.

We now provide a built-in completion display because we can include it in the
minibuffer overlay nicely. There is still much to be done to make things behave
sensibly when completing long things or with lots of completions.

The jury is still also out on multiple columns in the completions display. I'm
thinking I probably do want them...
Allow get/set of width/height/scrollTop/Left.

The level of boilerplate here is getting to me. Revampery forthcoming.
Buffer/View properties now use Property.

This allows us to expose non-reactive versions in the Foo classes and then
simultaneously refine and implement those with reactive versions in the RFoo
class.

It is unfortunate that callers have to sprinkle () all over the place, but I
prefer not to repeat myself four times just to declare a property, and I like
that this unifies everything under a single name. No more foo and fooV.