Add option to store multi-line values in multiple lines

[cvbge]

Please add option to split values into multiple lines if the value contains newline characters. This way it's easier for humans to read such file. If you make a change in line 2 and do a diff, you will see that the line 2 is changed, and not whole record

KEY=line 1\n\ line 2\n\ line 3

Right now it is stored as

KEY=line 1\nline 2\nline 3