0.8 Multiball activated

• Added multiball spawn (number and time interval)
• Added confirm dialog to save and load operations
• Reduced zoom max distance
• DOF disabled
• Fixed UI safe zone
• Still messing with physics values. Now the physics should replicate a metal marble, the speed is increased and it should be more fun and dynamic
• Removed ball speed info

Next update:

• Enable overwriting check on previously saved tracks
• More blocks