Determine and keep EOL (for saving/reading files) (\n vs \r\n)

From @jeromg

----

Hi there,

I'm syncing files (using syncthing) between a windows machine and an android phone. I really love the app, the only glitch I have right now is related to the end-of-line chars :

When I edit a file on the phone, it's synced to my laptop but end-of-line chars become CR only and not CR-LF as windows expects. Is there a way to change this (couldn't find a way)?

Thanks again for the great app! Keep up the good job.

Cheers /jerome

----

The issue does not name files, tests, or an entry point. Start by locating Markor's file-reading and saving paths, then determine how line endings are currently handled on Android and Windows; done means preserving or allowing the expected LF versus CRLF behavior when files are edited and synced.

Written by the indexing model from the issue text.