New text align class, .text-nowrap, for preventing text from breaking to new lines. Applies it to the grid docs table.

Fixes #13548: Use position: absolute; to fix checkbox and radio line-height problems that were introduced after #13003

Fixes #13066: Add z-index to the form control feedback icons so input groups don't render on top of them

Fixes #13003: Move padding on radio and checkbox options from the surrounding div to the label to remove the no-click deadzone caused by negative margin

Ensures proper sizing and alignment of input groups within inline and
navbar forms.

* Uses `inline-table` on the input group
* Nukes the widths to `width: auto`—without this, the parent input
group doesn’t size correctly and functions as `display: table;` or
`block`

* Removes default max-height from .navbar-collapse (so not every navbar
will get a max-height collapse section)
* Scopes regular 340px max-height to fixed top and bottom navbars only
(those are the only ones that really need a max-height to enable
scrolling)
* Adds a landscape media query for phones to cap the max-height at
200px for fixed navbars"