Store Notes as Markdown files

[PHHENS]

It would be nice that each note could be stored as a markdown file.
The directory containing the files could be set with preferences.
That could help Image support into notes too.
Markdown is a powerful formated text format.

Thanks for all what has already be done.

[joaocandre]

+1 it would be useful for people syncing with other devices, such as mobile phones, where the offer of note-taking apps with Markdown syntax is huge.