Enh: Trimming Unicorn filesize

[ajstrongdev]

Right now we use the xfce4-goodies package. We really should see and curate a list of actual xfce4-goodies that we utilise, and remove the excess.

Since xfce4-goodies is a metapackage, we can rather install the packages we use instead of the entire metapackage.

[oklopfer]

nope we need all of em, its the smaller choice to installing xfce as a whole, which unicorn mobile does, but unicorn desktop does not.