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