Refactor syntax unicode get ep2 new

Updates on
``` 
MCEngineSplitScriptIntoMessageAndParameters(), 
MCFilesExecReadComplete(), 
MCFilesExecWriteToFileOrDriver(), 
MCFilesExecWriteToProcess(), 
MCStoreGetPurchaseList(). 
```
Program crashes because of ```MCFilesExecWriteToFileOrDriver() ``` method.