Add filedropped and directorydropped callbacks

Author: rm-code

Screen.lua

@@ -45,6 +45,10 @@ function Screen.new()
 
     function self:focus(dfocus) end
 
+    function self:directorydropped(path) end
+
+    function self:filedropped(file) end
+
     function self:resize(w, h) end
 
     function self:visible(dvisible) end

ScreenManager.lua

@@ -161,6 +161,22 @@ function ScreenManager.resize(w, h)
     end
 end
 
+---
+-- Callback function triggered when a directory is dragged and dropped onto the window.
+-- @param file - The full platform-dependent path to the directory.
+--
+function ScreenManager.directorydropped(path)
+    ScreenManager.peek():directorydropped(path);
+end
+
+---
+-- Callback function triggered when a file is dragged and dropped onto the window.
+-- @param file - The unopened File object representing the file that was dropped.
+--
+function ScreenManager.filedropped(file)
+    ScreenManager.peek():filedropped(file);
+end
+
 ---
 -- Update all screens on the stack whenever the game window gains or
 -- loses focus.