Introduce meta packages

This helps us declutter the image bootstrap and makes it more obvious
why we have what in the image.

Rename the themes package while at that.

Closes: #1

debian/changelog

+librem5-base (1) UNRELEASED; urgency=medium
+
+  * Add meta packages
+
+ -- Guido Günther <agx@sigxcpu.org>  Thu, 13 Sep 2018 12:44:26 +0200
+
 librem5-themes (0) unstable; urgency=medium
 
   * Initial release

debian/control

-Source: librem5-themes
-Section: x11
+Source: librem5-base
+Section: metapackages
 Priority: optional
 Maintainer: Guido Günther <agx@sigxcpu.org>
 Build-Depends:
@@ -7,12 +7,69 @@ Build-Depends:
 Standards-Version: 4.1.4
 Homepage: https://code.puri.sm/guido.gunther/phosh
 
-Package: librem5-theme-default
+Package: librem5-base
+Architecture: all
+Depends:
+ ${misc:Depends},
+ ${shlibs:Depends},
+ ca-certificates,
+ cloud-initramfs-growroot,
+ dosfstools,
+ flatpak,
+ libgl1-mesa-dri,
+ libmbim-utils,
+ libnss-systemd,
+ libpam-systemd,
+ libqmi-utils,
+ locales,
+ lvm2,
+ modemmanager,
+ usb-modeswitch,
+ usbutils,
+ librem5-base-defaults (>= ${source:Version}),
+Description: Meta package for the Librem5
+ This package contains base dependencies for the librem5
+ .
+ It should be installed on every librem5.
+
+Package: librem5-gnome
 Architecture: all
+Depends:
+ ${misc:Depends},
+ ${shlibs:Depends},
+ libwlroots-examples,
+ phosh,
+ calls,
+ epiphany-browser,
+ evince,
+ gnome-calendar,
+ gnome-chess,
+ gnome-contacts,
+ gnome-control-center,
+ gnome-maps,
+ gnome-online-accounts,
+ gnome-session,
+ gnome-settings-daemon,
+ gnome-terminal,
+ gnome-tweaks,
+ network-manager-gnome,
+ xdg-desktop-portal-gtk,
+ librem5-base,
+Description: GNOME meta package for the Librem5
+ This package contains the GNOME apps for the Librem5
+ .
+ It should be installed on every librem5.
+
+Package: librem5-base-defaults
+Architecture: all
+Section: x11
 Depends:
  ${misc:Depends},
  ${shlibs:Depends},
  gnome-themes-extra-data,
+Breaks: librem5-theme-default (<= 1),
+Replaces: librem5-theme-default (<= 1),
+Provides: librem5-theme-default,
 Description: Default themes and configuration for the Librem-5
  This package contains configuration and themes for the librem5.
  It ships: