Markdown converter: Add option to break lines on single EOL

Hi. I'd like Markor to be able to, either automatically or via a new option in settings, break lines on single EOL in View mode. I have many markdown files where just single EOL separates some/many lines (regular, lists, etc) and other editors (can) display them not concatenated. If a line ends with double EOL, than the usual behaviour is used (no extra empty lines are inserted). This simple option would make Markor usable in many more scenarios. Thanks.

Locate the Markdown converter and the View mode rendering path in the Android app, then inspect how single and double EOLs are currently handled. Decide from the issue whether the behavior belongs behind a setting or should be automatic, and verify that single EOLs break lines while double EOLs retain the usual behavior.

Written by the indexing model from the issue text.