hawaii: Reuse the same svg image for arrows
hawaii: Notifications style
hawaii: Install all files under QML module
hawaii: Mask the notifications background

Use an opacity mask to cut a rounded rectangle on the noise
background.
hawaii: Give notification style implicit size
hawaii: Use color scope for panel style
hawaii: Fix styles import in panel style
hawaii: Less transparent panel style
hawaii: Use icon size hint from tool button
hawaii: Button style
hawaii: Calendar style