Adding Community Editions to EndeavourOS Installer

read here how you can add your Community Edition into the EndeavourOS installer.

We will implement the new way to handle Editions soon as the old method is causing unwanted conflicts (p.e. package conflicts) So we change to packagechooser module where you can choose only one Edition to be installed, also deselecting packages for the is not be possible anymore, what will avoid issues also, base packages can still be deselected.