Remove pthread dependency

include/ftxui/screen/image.hpp

@@ -20,6 +20,9 @@ class Image {
   Image() = delete;
   Image(int dimx, int dimy);
 
+  // Destructor:
+  virtual ~Image() = default;
+
   // Access a character in the grid at a given position.
   std::string& at(int x, int y);
   const std::string& at(int x, int y) const;

include/ftxui/screen/screen.hpp

@@ -11,7 +11,6 @@
 
 #include "ftxui/screen/image.hpp"     // for Pixel, Image
 #include "ftxui/screen/terminal.hpp"  // for Dimensions
-#include "ftxui/util/autoreset.hpp"   // for AutoReset
 
 namespace ftxui {
 
@@ -31,6 +30,9 @@ class Screen : public Image {
   static Screen Create(Dimensions dimension);
   static Screen Create(Dimensions width, Dimensions height);
 
+  // Destructor:
+  ~Screen() override = default;
+
   std::string ToString() const;
 
   // Print the Screen on to the terminal.