feat(subheader): Expose the text color of subheader list items
feat(subheader): Expose the text color of subheader list items

Also fix the font weight being wrong.

osechet/qml-material,papyros/qml-material,osechet/qml-material,hunt978/qml-material,benevo-qml/qml-material,benevo-qml/qml-material,hunt978/qml-material,osechet/qml-material,papyros/qml-material,papyros/qml-material,papyros/qml-material,hunt978/qml-material,benevo-qml/qml-material,benevo-qml/qml-material,osechet/qml-material,hunt978/qml-material