As part of adding validation to Field, the logic is simpler to follow if we can
assume that all usages of Field use it as a controlled component, instead of
supporting both controlled and uncontrolled.
This converts the uncontrolled usages to controlled.
These icons are based on Feather as the original source, but they have various
tweaks applied, such as stroke width, color, etc. Hopefully the tweaked name
makes this more obvious in the future.
