Notable changes:
Colors
Darken primary color in light variants
Lighten primary color in dark variant
Lighten separator color in dark variant
Darken dark color scheme slightly
Change inactive window's title bar background-color
Update error/warning/success/visited colors to meet accessibility standards
Styles
Change focus style from outline to overlay
Change all drop style to much hover style
Change disabled scale style
Change hover style of combo buttons
Change combo entry style
Change osd toolbar style like YouTube's floating toolbar
Update typography in gnome-shell
Update style and logic of shadows to much the latest Material Design guidelines
Update stack sidebar style
Update info bar style
Adjust text button sizing
Use primary color for dialog buttons
Remove a separator from LightDM's dialog
Normalize tab bar height in gnome-terminal & tilix
Others
Make transition a little faster
Sync GTK2 entry/combobox/spinbutton styles with GTK3
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