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_unhars", the file position is set to the first chst character that was not read. If the file contains NUL characters, then the input is read NUL cter, and tand the positionition t AFTt AFTt AFTE AFTER the NUL)