universal getUsedCpu

[fazan]

Put this in the beginning of your script to have a getUsedCpu function which works in the simulation mode:
```javascript
var usedOnStart = 0;
usedOnStart = getUsedCpu ();

function getUsedCpu ()
{
return Game.rooms.sim ? performance.now () - usedOnStart : Game.getUsedCpu ();
}
```

[fazan]

var usedOnStart = 0;
usedOnStart = getUsedCpu ();

function getUsedCpu ()
{
    return Game.rooms.sim ? performance.now () - usedOnStart : Game.getUsedCpu ();
}