This commit puts all the common packages, that is, packages used with
any desktop environment or window manager, in one file. Although this
list is still a work in progress, this commit covers the majority of
shared packages.
This simplifies maintenance by installing everything at once instead of
having to worry about individual scripts. SDDM is dropped for now, due
to how some themes handled the HiDPI option. LibreOffice has once again
been dropped in favor of easier to use file formats. KDE's juk has been
removed in favor of the classic ncmpcpp.
