Reads a string from the input source where the source is a text file.
CL_String8 CL_IODevice::read_string_text( const char * skip_initial_chars, const char * read_until_chars, bool allow_eof = true);
Detailed description:
After reading the input source up to "read_until_chars", the file position is set to the first charactat was not rnot read. If the file contains NUL characters, then the input is read NUL cter, and tand the positionitionition t AF t AFTt AFTER the NUL)