Feature Request: Allow multiple root folders to be added to the sidebar about zettlr

[nathanlesage]

Good idea, I had planned this as well. But first I have to fix several issues concerning the watching of the files (there's still a mess)

[nathanlesage]

Hello there,

as announced in #14, here the additional changes that will be coming when this feature is finally implemented (because, programmatically it's rather easy to combine the following three things):

1. Open several root folders (obviously)
2. Open no folder on first startup at all (e.g. simply present the user with a little plus sign or something like that to indicate that he/she can begin adding stuff)
3. Also open single files. This would then enable the app to register itself as handler for *.md-files, so that you can double click on those and open single files without parsing a whole folder.