1.3 GW - Updated game version

- Video background in main menu [b]Single game:[/b] - From 34 to 19 enemies + optimisation - Texts changes 1.2 GW - Updated game version : - Changed background and animated main menu [b]Single game:[/b] - demarcated rock (collisions fixed) - added a new cloud system in the sky - changed interfaces and info texts - added music - made numbers over enemies - T-rex is seen at the beginning of the mission [b]Multiplayer:[/b] - demarcated rock (collisions fixed) - added a new cloud system in the sky - Simplified leveling by experience - changed the path of the t-rex