mainLoop method
Implementation
int mainLoop( dynamic func, ClipParam childParam, ClipToken? funcParam, ClipParam? parentParam ){
resetLoopCount();
ParamInteger step = ParamInteger();
ParamInteger err = ParamInteger();
ParamInteger ret = ParamInteger();
if( beginMain( func, childParam, step, err, ret, funcParam, parentParam ) ){
while( main( func, childParam, step, err, ret ) ){}
}
termMain( func, childParam, parentParam );
return ret.val();
}