Add Blink. Refactor examples.

examples/dom/CMakeLists.txt

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+example(frame)
+example(separator)
+example(vbox_hbox)

examples/dom/frame.cpp

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+#include <chrono>
+#include <iostream>
+#include <thread>
+
+#include "ftxui/screen.hpp"
+#include "ftxui/dom/elements.hpp"
+
+int main(int argc, const char *argv[])
+{
+  using namespace ftxui::dom;
+	auto document =
+		hbox(
+			frame(hcenter(text(L" main frame ")),
+				vbox(
+					text(L"Line 1"),
+					text(L"Line 2"),
+					text(L"Line 3"),
+					frame(
+						vbox(
+							text(L"Line 4"),
+							text(L"Line 5"),
+							text(L"Line 6")
+						)
+					),
+					hbox(
+						frame(text(L"frame 2"),
+							vbox(
+								text(L"Line 4"),
+								text(L"Line 5"),
+								text(L"Line 6")
+							)
+						),
+						frame(text(L"frame 3"),
+							vbox(
+								text(L"Line 7"),
+								text(L"Line 8"),
+								text(L"Line 9")
+							)
+						)
+					),
+					text(L"footer footer footer footer footer")
+				)
+			),
+			flex()
+		);
+  auto screen = ftxui::Screen::TerminalOutput(document);
+  Render(screen, document.get());
+  std::cout << screen.ToString() << std::endl;
+}

examples/dom/separator.cpp

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+#include "ftxui/screen.hpp"
+#include "ftxui/dom/elements.hpp"
+#include <iostream>
+
+int main(int argc, const char *argv[])
+{
+  using namespace ftxui::dom;
+  auto document =
+    hbox(
+      text(L"left-column"),
+      separator(),
+      flex(vbox(
+        flex(center(text(L"right-column"))),
+        separator(),
+        center(text(L"bottom-column"))
+      ))
+    );
+  auto screen = ftxui::Screen::TerminalFullscreen();
+  Render(screen, document.get());
+
+  std::cout << screen.ToString();
+  getchar();
+
+  return 0;
+}

examples/dom/vbox_hbox.cpp

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+#include "ftxui/screen.hpp"
+#include "ftxui/dom/elements.hpp"
+#include <iostream>
+
+int main(int argc, const char *argv[])
+{
+  using namespace ftxui::dom;
+  auto document =
+    vbox(
+      hbox(
+        text(L"north-west"),
+        flex(),
+        text(L"north-east")
+      ),
+      flex(),
+      hbox(
+        hbox(
+          flex(),
+          text(L"center"),
+          flex()
+        )
+      ),
+      flex(),
+      hbox(
+        text(L"south-west"),
+        flex(),
+        text(L"south-east")
+      )
+    );
+  auto screen = ftxui::Screen::TerminalFullscreen();
+  Render(screen, document.get());
+
+  std::cout << screen.ToString();
+
+  return 0;
+}