Import: .rtf files

[mkoskim]

RTF is really common export format amongst writers. Being able to read these in would be absolutely great!

AFAIK, RTF really does not have any information about document structure (headings and so on). It only tells how some piece of text should be formatted.

So, the first phase would be to convert RTF to plain text, and use text importing to get it in. But if possible, we could try to get it better. If we need user intervention to that (e.g. when trying to guess scene / part breaks), implement a suitable GUI for the process.

Both .docx and .rtf files (stories) can be really large! If we can automatize the part/scene separation, it would be great.