Component:
* Feature: Support ResizableSplit with customizable separator.
* Fix: Support arrow keys in application mode
* Fix: Remove useless new line when using an alternative screen.
Dom:
* Feature: Add the dashed style for border and separator:
See DASHED enum, and separatorDashed(), borderDashed() functions.
* Feature: Add colored borders.
See functions: borderStyled(BorderStyle, Color) and borderStyled(Color).
* Feature: Add LinearGradient. It can be used in color and bgColor.
* Improvement: Color::Interpolate() uses gamma correction.
* Fix: Check the graph area is positive.
Build/Install:
* Use globally set CMAKE_CXX_STANDARD if it is set.
* Expose the pkg-config file.
OBS-URL: https://build.opensuse.org/package/show/devel:libraries:c_c++/ftxui?expand=0&rev=6
