feat: work on running and weapon inventory

modules/wave_survival/weapon_inventory.h

@@ -0,0 +1,33 @@
+#ifndef WEAPON_INVENTORY_H
+#define WEAPON_INVENTORY_H
+
+#include "scene/main/node.h"
+#include "scene/resources/packed_scene.h"
+class PlayerBody;
+class WeaponBase;
+
+class WeaponInventory : public Node {
+	GDCLASS(WeaponInventory, Node);
+	static void _bind_methods();
+	void on_switch_input();
+	void ready();
+	void select_weapon(WeaponBase *next);
+protected:
+	void _notification(int what);
+
+public:
+	void set_fallback_weapon(Ref<PackedScene> scene);
+	Ref<PackedScene> get_fallback_weapon() const;
+
+	WeaponBase *get_current_weapon() const;
+
+private:
+	unsigned current{ 0 };
+	LocalVector<WeaponBase *> weapons{ nullptr, nullptr };
+	WeaponBase *current_weapon{ nullptr };
+	WeaponBase *fallback_weapon{ nullptr };
+
+	Ref<PackedScene> default_weapon_scene{};
+};
+
+#endif // !WEAPON_INVENTORY_H