Refactor operations with temporary files

[Gennady Trafimenkov]

It is necessary:

1) use unique temporary folders for every process, not "temp" in the config_folder/tmp as it now;

2) avoid using game resources file operations (e.g. GCM->openGameResForReading) for working with temporary files. Use new functions (e.g. GCM->openTempFileForReading instead).