Convert \r into \n (#350)

This resolves:
https://github.com/ArthurSonzogni/FTXUI/issues/337

CHANGELOG.md

@@ -30,6 +30,9 @@ Element gaugeDirection(float ratio, GaugeDirection);
 - **bugfix** Container::Tab implements `Focusable()`.
 - **bugfix** Improved default implementations of ComponentBase `Focusable()` and
   `ActiveChild()` methods.
+- **bugfix** Automatically convert '\r' keys into '\n' for Linux programs that
+  do not send the correct code for the return key, like the 'bind'.
+  https://github.com/ArthurSonzogni/FTXUI/issues/337
 
 2.0.0
 -----

src/ftxui/component/event.cpp

@@ -58,11 +58,7 @@ const Event Event::ArrowDown = Event::Special("\x1B[B");
 const Event Event::Backspace = Event::Special({127});
 const Event Event::Delete = Event::Special("\x1B[3~");
 const Event Event::Escape = Event::Special("\x1B");
-#if defined(_WIN32)
-const Event Event::Return = Event::Special({13});
-#else
 const Event Event::Return = Event::Special({10});
-#endif
 const Event Event::Tab = Event::Special({9});
 const Event Event::TabReverse = Event::Special({27, 91, 90});
 const Event Event::F1 = Event::Special("\x1B[OP");

src/ftxui/component/terminal_input_parser.cpp

@@ -52,6 +52,13 @@ void TerminalInputParser::Send(TerminalInputParser::Output output) {
       return;
 
     case SPECIAL:
+      // Microsoft's terminal uses a different new line character for the return
+      // key. This also happens with linux with the `bind` command:
+      // See https://github.com/ArthurSonzogni/FTXUI/issues/337
+      // Here, we uniformize the new line character to `\n`.
+      if (pending_ == "\r")
+        out_->Send(Event::Special("\n"));
+      else
         out_->Send(Event::Special(std::move(pending_)));
       pending_.clear();
       return;