Without access to the Shadow DOM pseudo-elements, the placeholder
behaviour needs to be reimplemented.
Update to match React Native's modification to `TextInput` to include
all `View` props and use the `Text` style props.
Fix#12Fix#48
Expand shorthand properties to preserve the one-rule-to-one-style
isolation. Resolve styles like React Native - most specific comes last.
Add support for the hz and vt properties for margin and padding.
Fix#40
