Multiline text support with EFML

[ClassicOldSong]

Add a symbol | to support multiline with automatically new line support, no need to add a &n at each line like using . strings.

Example:

>pre
  .This is a single line content.
  . This line of text is following the first line.
  |This starts a new line by automatically adding an `&n` to the beginning of the line.
  |A new line is started.
  |Another new line is started.
  . This follows the previous line.