Implement World rearrange and add RandomBot and main

Make World::checkEffects non-const and provide its implementation.
Add RandomBot implementation and declare a private randomNumber helper.
Add a simple main() entrypoint.

main.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+#include "include/Game.h"
+
+int main () {
+    try {
+        Game game;
+        game.run ();
+    } catch ( const std::exception& e ) {
+        std::cerr << "Fatal Error: " << e.what() << "\n";
+        return 1;
+    }
+    return 0;
+
+}