Mario: add mushroom block

mario/blocks/mushroomblock.hpp

@@ -0,0 +1,17 @@
+#ifndef MUSHROOM_BLOCK_HPP
+#define MUSHROOM_BLOCK_HPP
+
+#include "../blocks.hpp"
+
+class MushroomBlock : public MarioBlock {
+public:
+    MushroomBlock( int x, int y, std::shared_ptr< SDLPP::Renderer > &renderer );
+    void custom_move(int ticks) override;
+    void setParent(MarioBlock *parent);
+    void handleVisitor(SDLPP::Visitor &visitor) override;
+private:
+    MarioBlock *_parent = nullptr;
+    bool _started_movement = false;
+};
+
+#endif