Path separation, and permission to write

[ZehCnaS34]

When saving at the default package directory

When you want to change the directory where the package is generated.

When you do not have the correct permission to save at particular directory

And when the directory you are trying to save in does not exist.

Simple notifications

I also started adding simple progression (progress bar), but it's kind of adhoc-ish for the time begin. I will most likely separate that functionality into another module.