1.2 GW - Updated game version

- Changed background and animated main menu
Single game:
- delimited the rock with solid collision
- added a new cloud system in the sky
- changed interfaces and info texts
- added music
- made numbers over enemies
- added the t-rex path on mission start
Multiplayer:
- delimited the rock with solid collision
- added a new cloud system in the sky
- Simplified leveling by experience
- t-rex path changed