[Feature Request] Custom sync folder

[sarlej]

Hello, it will be nice to have option for select custom directory for notes saving and save notes in text. This way, we can use any service for syncing boostnote files with other devices and edit them with any editor (eg. in commandline editors).

[pcause]

this is a duplicate of #63

[tatoosh]

Any changes here to change local folder in Android?

[tatoosh]

Please give us a short food oft thought, maybe we can change the code?