malcontent-control: Reformat and rename code from gnome-control-center

Make it fit in with the surrounding code style, and rename the classes
to `MctCarousel` and `MctUserControls`. List them in `meson.build` and
`POTFILES.in`. No other changes.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

malcontent-control/meson.build

@@ -14,13 +14,23 @@ malcontent_control = executable('malcontent-control',
   [
     'application.c',
     'application.h',
+    'carousel.c',
+    'carousel.h',
+    'gs-content-rating.c',
+    'gs-content-rating.h',
     'main.c',
+    'user-controls.c',
+    'user-controls.h',
+    'user-image.c',
+    'user-image.h',
   ] + resources,
   dependencies: [
+    dependency('accountsservice'),
     dependency('gio-2.0', version: '>= 2.44'),
     dependency('glib-2.0', version: '>= 2.54.2'),
     dependency('gobject-2.0', version: '>= 2.54'),
     dependency('gtk+-3.0'),
+    dependency('flatpak'),
     libmalcontent_dep,
   ],
   include_directories: root_inc,
@@ -75,7 +85,11 @@ if xmllint.found()
     args: [
       '--nonet', '--noblanks', '--noout',
       '--relaxng', join_paths(gtk_prefix, 'share', 'gtk-3.0', 'gtkbuilder.rng'),
-      files('main.ui'),
+      files(
+        'carousel.ui',
+        'main.ui',
+        'user-controls.ui',
+      ),
     ],
     suite: ['malcontent-control'],
   )