Add modules support (#1015)

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

src/ftxui/screen/box.cppm

@@ -0,0 +1,18 @@
+/**
+ * @file box.cppm
+ * @brief Module file for the Box struct of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/box.hpp>
+
+export module ftxui.screen.box;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Box;
+}

src/ftxui/screen/color.cppm

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+/**
+ * @file color.cppm
+ * @brief Module file for the Color class of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/color.hpp>
+
+export module ftxui.screen.color;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Color;
+
+    inline namespace literals {
+        using ftxui::literals::operator""_rgb;
+    }
+}

src/ftxui/screen/color_info.cppm

@@ -0,0 +1,20 @@
+/**
+ * @file color_info.cppm
+ * @brief Module file for the ColorInfo struct of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/color_info.hpp>
+
+export module ftxui.screen.color_info;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::ColorInfo;
+
+    using ftxui::GetColorInfo;
+}

src/ftxui/screen/deprecated.cppm

@@ -0,0 +1,19 @@
+/**
+ * @file box.cppm
+ * @brief Module file for the deprecated parts of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/deprecated.hpp>
+
+export module ftxui.screen.deprecated;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::wchar_width;
+    using ftxui::wstring_width;
+}

src/ftxui/screen/image.cppm

@@ -0,0 +1,18 @@
+/**
+ * @file image.cppm
+ * @brief Module file for the Image class of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/image.hpp>
+
+export module ftxui.screen.image;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Image;
+}

src/ftxui/screen/pixel.cppm

@@ -0,0 +1,18 @@
+/**
+ * @file pixel.cppm
+ * @brief Module file for the Pixel struct of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/pixel.hpp>
+
+export module ftxui.screen.pixel;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Pixel;
+}

src/ftxui/screen/screen.cppm

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+/**
+ * @file screen.cppm
+ * @brief Module file for the Screen class of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/screen.hpp>
+
+export module ftxui.screen.screen;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    namespace Dimension {
+        using ftxui::Dimension::Fixed;
+        using ftxui::Dimension::Full;
+    }
+
+    using ftxui::Image;
+    using ftxui::Screen;
+}

src/ftxui/screen/string.cppm

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+/**
+ * @file string.cppm
+ * @brief Module file for string functions of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/string.hpp>
+
+export module ftxui.screen.string;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::to_string;
+    using ftxui::to_wstring;
+    using ftxui::string_width;
+    using ftxui::Utf8ToGlyphs;
+    using ftxui::CellToGlyphIndex;
+}

src/ftxui/screen/terminal.cppm

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+/**
+ * @file terminal.cppm
+ * @brief Module file for the Terminal namespace of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/terminal.hpp>
+
+export module ftxui.screen.terminal;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Dimensions;
+
+    namespace Terminal {
+        using ftxui::Terminal::Size;
+        using ftxui::Terminal::SetFallbackSize;
+        using ftxui::Terminal::Color;
+        using ftxui::Terminal::ColorSupport;
+        using ftxui::Terminal::SetColorSupport;
+    }
+}