* Reorganize forms.less
* Change from attribute selectors to `.form-control`. Few lines, less
specific (meaning easier overrides as `element[type=""]` is more
specific than a class), less intrusive, and more performant.
* Add `.form-group` for basic spacing in vertical forms.
* Remove (unnecessary?) `margin: 0;` from `form` element (as far as I
can tell no browser sets that anyway).
* Cuts close to 100 lines of CSS from the table CSS
* File size aside, this drastically simplifies CSS for folks looking to
build on top of the `.table-bordered` option as a starting point
This particular form control is wildly inaccurate across browsers, so
we're removing the `height` and `line-height`, but adding `display:
block` so it renders similarly to our other inputs.
Restores `font-size` and more to the `<select>` element while also
changing from `min-height` to `height` for input sizing.
Fixes#8520 as opened by @ShaunR (would've merged that PR but I moved
everything around right before).
