Disk file manipulation.
make System.file(name, mode): Opens a file.
stderr: Standard error.
stdin: Standard input.
stdout: Standard output.
close(): Closes file and prevents further operations on this object.
exists(path): Checks to see if there is a file at the given path.
read(bytes): Read a stream of bytes into a string.
readline(): Read a single line of text into a string.
seek(pos): Move current position in file.
size(path): Returns the size of the file at the given path.
tell(): Return current position in file.
write(string): Write string to file.