Standardize conversion processes.

Too many arguments for or against the many methods:
stick to one inside a common function.

This commit will force recompilation of many files.

src/GameCommand.cpp

@@ -335,12 +335,12 @@ void GameCommand::LoadOne( const Command& cmd )
 
 	else if( sName == "weight" )
 	{
-		m_iWeightPounds = atoi( sValue );
+		m_iWeightPounds = StringToInt( sValue );
 	}
 
 	else if( sName == "goalcalories" )
 	{
-		m_iGoalCalories = atoi( sValue );
+		m_iGoalCalories = StringToInt( sValue );
 	}
 
 	else if( sName == "goaltype" )