New plane, new menu, new mission

In this update I change lot of things :

- I completely rebuild the menu (new scene, new UI), the resolution can now be change(3 different resolutions).

- The clouds and the missile smoke trail has been changed to be more handsome, the 3D model of the missile has also been changed including its appearance.

- Now each planes have different characteristics according to its role (ex : a fighter will be more effective in dogfight than a bomber), there are three characteristics : Air-Ground effectiveness, Air-Air effectiveness, and maniability

- I added a new plane : The A10-A, it's specialized in air-ground mission, more effective against ground target than air target but has less maniability and speed than a fighter

- A new mission is now available , which take place in the night where the player must clear an harbor and its airport to create a spearhead.

-Now the player camera can look at his target by holding left mouse button.

- A feedback now appear when a missile hit an enemy, which indicate if the target was only hit or destroyed

- The minimap has been reworked , and show enemy and allied planes, and also missiles.