v20190201

Notable changes:

• Added support for Plank
• Added support for Xfce >=4.13
• Dropped support for Budgie <10.4
• Dropped (teal) secondary color
• Changed entry style (as per refreshed Material Design Guidelines)
• Changed combo button style (as per refreshed Material Design Guidelines)
• Changed selected state style (as per refreshed Material Design Guidelines)
• Changed sidebar style (as per refreshed Material Design Guidelines)
• Changed headerbar's separator style
• Tweaked button colors
• Changed progress bar background-color to neutral gray
• Changed disabled check/radio colors
• Dropped excessive check/radio animations
• budgie: Changed raven's tab bar colors
• gnome-shell: Fixed .workspace-thumbnail-indicator position
• gnome-shell: Tweaked transitions
• Applied various style improvements for Budgie and Cinnamon