Import styles from Hawaii Shell
styles: Remove obsolete styles

Those styles are not needed anymore with KF5.
styles: Port away from QConfiguration

We no longer use it, port away.
styles: Assume "Maui" as default and fall back to "Base"
styles: Remove dpiScaleFactor from StyleSettings

We use Plasma units now.
Add header with installation directories
styles: Remove palette from Style
styles: Document Style.item
styles: Change license notice
styles: Remove dpiScaleFactor from Style

We use Plasma units now.
styles: Add Style default property