Stop using Sender/Receiver in TerminalInputParser. (#1073)

Stop using Sender/Receiver in TerminalInputParser.

This will help removing usage of thread.

At some point, my goal is to have an initialization step when installing
the ScreenInteractive so that we can provide the terminal ID
synchronously without losing some events. This will help with:
https://github.com/ArthurSonzogni/FTXUI/pull/1069

include/ftxui/dom/canvas.hpp

@@ -30,7 +30,7 @@ namespace ftxui {
 /// - 2x4 braille characters (1x1 pixel)
 /// - 2x2 block characters (2x2 pixels)
 /// - 2x4 normal characters (2x4 pixels)
-/// 
+///
 /// You need to multiply the x coordinate by 2 and the y coordinate by 4 to
 /// get the correct position in the terminal.
 ///

include/ftxui/dom/flexbox_config.hpp

@@ -12,7 +12,6 @@
 
 namespace ftxui {
 
-
 /// @brief FlexboxConfig is a configuration structure that defines the layout
 /// properties for a flexbox container.
 //

include/ftxui/screen/box.hpp

@@ -11,7 +11,7 @@ namespace ftxui {
 /// It is defined by its minimum and maximum coordinates along the x and y axes.
 /// Note that the coordinates are inclusive, meaning that the box includes both
 /// the minimum and maximum values.
-/// 
+///
 /// @ingroup screen
 struct Box {
   int x_min = 0;