- FlatDarkLaf.properties: changed darken() to lighten(), which does not change real colors due to autoInverse mechanism
- FlatLightLaf.properties: use also derived colors (to be consistent with FlatDarkLaf.properties and fix warning in UIDefaultsDump)
- fixed menu item check colors
- fixed MenuItem.underlineSelectionColor
- fixed List, Tree and Table selectionInactiveForeground in light Arc themes
- fixed List and Table background colors in Material UI Lite themes
- use `CheckBox.icon.selectedBackground` as base color for derived "selected" colors
- use derived colors for `CheckBox.icon[filled].selectedHoverBackground` and `CheckBox.icon[filled].selectedPressedBackground`
- removed unnecessary `CheckBox.icon.selectedFocusedBorderColor`from FlatDarkLaf.properties
- added missing keys to FlatLafUIKeys.txt
(preparation for #176)
- changed default color to bluish
- made track thinner (2px, was 3px)
- made thumb larger (12px, was 11px)
- added thumb outline focus indicator (4px wide)
- slider component height increased from 11px to 20px
- support painting thumb border
- support different colors for thumb background and colored track
- updated with latest changes from FlatSliderUI
- use static FlatSliderUI methods for thumb painting
- hover/pressed feedback on single thumb
- hover/pressed feedback on middle track and both thumbs
- added JSlider components to FlatRangeSliderTest for easier testing/comparing
- use rounded rectangles for buttons in tab area
- "pressed" background for buttons in tab area
- fill background of buttons in tab area
- use derived colors for hover and pressed
- fixed missing arrow in "more tabs" button at larger scaling
- made tabs separator color lighter in dark themes so that it is easier to recognize the tabbed pane
- added top and bottom tab insets to avoid that large tab icons are painted over active tab underline
