File class 추가 수정 (Optional)

[Moongss]

• Current Usage

File file("file_path");
std::string line;
file.openFile();
while (!file.isStateDone())
{
    line = file.getLine();
    if (line != "")
	/* code */
}
file.closeFile();
return (0);

• To Update Usage (like ifstream!)

File file;
std::string line;

  /* this part */
file.open(mFilePath.c_str());
if (!file.is_open())
throw Class::ClassException("The dummy file can't open.");

while (file.getline(line)) // getline(std::string &line)
{
    if (line != "")
	    mEachConfigLine.push_back(line);
    if (file.isStateDone())
	    break;
}
file.closeFile();