add 'perspective' NotePreset property

src/window/Camera.cpp

@@ -66,3 +66,7 @@ void Camera::setFov(float fov) {
 float Camera::getFov() const {
     return fov;
 }
+
+float Camera::getAspectRatio() const {
+    return aspect;
+}

src/window/Camera.hpp

@@ -35,4 +35,6 @@ public:
 
     void setFov(float fov);
     float getFov() const;
+
+    float getAspectRatio() const;
 };