Auto detecting the EOL in a file

### Description

Notepad Next defaults to Windows style EOL for files opened in a unix environment that already contain UNIX style EOL. I have to manually select UNIX style EOL if I want to write the file again.

### Describe the solution you'd like

The editor should detect the EOL endings in a file and switch to it.

### Describe alternatives you've considered

Notepad++ does it automatically