Add modules support (#1015)

Add experimental C++20 module suppport.
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

cmake/ftxui_modules.cmake

@@ -0,0 +1,82 @@
+if (NOT FTXUI_BUILD_MODULES)
+  return()
+endif()
+
+add_library(ftxui-modules)
+
+target_sources(ftxui-modules
+  PUBLIC FILE_SET CXX_MODULES FILES
+  src/ftxui/component.cppm
+  src/ftxui/component/animation.cppm
+  src/ftxui/component/captured_mouse.cppm
+  src/ftxui/component/component.cppm
+  src/ftxui/component/component_base.cppm
+  src/ftxui/component/component_options.cppm
+  src/ftxui/component/event.cppm
+  src/ftxui/component/loop.cppm
+  src/ftxui/component/mouse.cppm
+  src/ftxui/component/receiver.cppm
+  src/ftxui/component/screen_interactive.cppm
+  src/ftxui/component/task.cppm
+  src/ftxui/dom.cppm
+  src/ftxui/dom/canvas.cppm
+  src/ftxui/dom/deprecated.cppm
+  src/ftxui/dom/direction.cppm
+  src/ftxui/dom/elements.cppm
+  src/ftxui/dom/flexbox_config.cppm
+  src/ftxui/dom/linear_gradient.cppm
+  src/ftxui/dom/node.cppm
+  src/ftxui/dom/requirement.cppm
+  src/ftxui/dom/selection.cppm
+  src/ftxui/dom/table.cppm
+  src/ftxui/screen.cppm
+  src/ftxui/screen/box.cppm
+  src/ftxui/screen/color.cppm
+  src/ftxui/screen/color_info.cppm
+  src/ftxui/screen/deprecated.cppm
+  src/ftxui/screen/image.cppm
+  src/ftxui/screen/pixel.cppm
+  src/ftxui/screen/screen.cppm
+  src/ftxui/screen/string.cppm
+  src/ftxui/screen/terminal.cppm
+  src/ftxui/util.cppm
+  src/ftxui/util/autoreset.cppm
+  src/ftxui/util/ref.cppm
+  )
+
+target_link_libraries(ftxui-modules
+  PUBLIC
+  ftxui::screen
+  ftxui::dom
+  ftxui::component
+  )
+
+target_compile_features(ftxui-modules PUBLIC cxx_std_20)
+# TODO: Explain why this is needed.
+if (CMAKE_COMPILER_IS_GNUCXX)
+  target_compile_options(ftxui-modules PUBLIC -fmodules-ts)
+endif ()
+
+add_library(ftxui::modules ALIAS ftxui-modules)
+
+if(FTXUI_ENABLE_INSTALL)
+
+  include(GNUInstallDirs)
+
+  install(TARGETS ftxui-modules
+    EXPORT ftxui-targets
+    FILE_SET CXX_MODULES
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftxui
+    FILE_SET HEADERS
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftxui
+    INCLUDES
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ftxui
+    )
+  install(EXPORT ftxui-targets
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ftxui
+    CXX_MODULES_DIRECTORY ${CMAKE_INSTALL_LIBDIR}/cmake/ftxui
+    )
+  install(FILES my_package-config.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/ftxui
+    )
+endif()