Basic static analysis fixes

- remove extraneous semicolons
- use "nullptr" instead of "0"
- remove "break" after "return"
- use <cstdio> instead of <stdio.h>

include/godot_cpp/variant/basis.hpp

@@ -233,7 +233,7 @@ struct _NO_DISCARD_ Basis {
 
 	static Basis looking_at(const Vector3 &p_target, const Vector3 &p_up = Vector3(0, 1, 0));
 
-	Basis(const Quaternion &p_quaternion) { set_quaternion(p_quaternion); };
+	Basis(const Quaternion &p_quaternion) { set_quaternion(p_quaternion); }
 	Basis(const Quaternion &p_quaternion, const Vector3 &p_scale) { set_quaternion_scale(p_quaternion, p_scale); }
 
 	Basis(const Vector3 &p_axis, real_t p_angle) { set_axis_angle(p_axis, p_angle); }

include/godot_cpp/variant/plane.hpp

@@ -43,7 +43,7 @@ struct _NO_DISCARD_ Plane {
 	real_t d = 0;
 
 	void set_normal(const Vector3 &p_normal);
-	_FORCE_INLINE_ Vector3 get_normal() const { return normal; };
+	_FORCE_INLINE_ Vector3 get_normal() const { return normal; }
 
 	void normalize();
 	Plane normalized() const;

include/godot_cpp/variant/quaternion.hpp

@@ -67,7 +67,7 @@ struct _NO_DISCARD_ Quaternion {
 
 	Vector3 get_euler_xyz() const;
 	Vector3 get_euler_yxz() const;
-	Vector3 get_euler() const { return get_euler_yxz(); };
+	Vector3 get_euler() const { return get_euler_yxz(); }
 
 	Quaternion slerp(const Quaternion &p_to, const real_t &p_weight) const;
 	Quaternion slerpni(const Quaternion &p_to, const real_t &p_weight) const;