Decoupled all icons from hard coded opacity values.
Removed opacity from icons in contrast themes.
Fixed HighContrastLightTheme using the incorrect icon theme.
Fixed issue where the content near the border of a BorderlessSplitPane could not be interacted with if the divider was disabled.
Fixed issue where the preferred divider style would not survive a laf/theme change.
Fixed issue where the OverlayScrollPane would not have the correct layout after laf change.
Fixed issue where an non-opaque menubar would result with graphic creep.
Added back CheckBox.icon and RadioButton.icon with StateIcons that paint accordingly to the abstract button they target.
Moved opacity values to custom properties.
Renamed #getName to #getPrefix and added new #getName which returns a display value (also via #toString).
Added option to parse capacities with ThemedSVGIcon.
Added HighContrastDarkTheme.
Optimized some demos.