Port to meson (#258)

* Port to meson

* plugin generation script: swtich to meson, update to python3, switch to libpeas, add some extra options, and cleanup

* clean up some build warnings

* kill xed-bugreport.sh with fire: it isn't used anymore, and probably doesn't even work

* update gzip command to avoid warnings on some systems and move appdata.xml to /usr/share/metainfo/ as that's where it's supposed to go now

* POTFILES.in: fix path that changed in the meson port, which was causing makepot to fail

plugins/wordcompletion/xed-wordcompletion-plugin.c

@@ -19,16 +19,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-#ifdef HAVE_CONFIG_H
 #include <config.h>
-#endif
-
-#include "xed-wordcompletion-plugin.h"
-
 #include <glib/gi18n-lib.h>
 #include <glib.h>
 #include <gio/gio.h>
-
 #include <xed/xed-debug.h>
 #include <xed/xed-window.h>
 #include <xed/xed-window-activatable.h>
@@ -39,6 +33,8 @@
 #include <gtksourceview/gtksource.h>
 #include <gtksourceview/completion-providers/words/gtksourcecompletionwords.h>
 
+#include "xed-wordcompletion-plugin.h"
+
 #define WINDOW_PROVIDER "XedWordCompletionPluginProvider"
 
 #define WORDCOMPLETION_SETTINGS_BASE "org.x.editor.plugins.wordcompletion"