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

help/LINGUAS

@@ -0,0 +1,23 @@
+ar
+bg
+ca
+cs
+da
+de
+el
+es
+fi
+fr
+hu
+it
+ja
+ko
+oc
+pt_BR
+ru
+sv
+th
+uk
+zh_CN
+zh_HK
+zh_TW

help/Makefile.am

@@ -1,16 +0,0 @@
-@YELP_HELP_RULES@
- 
-HELP_ID = xed
-HELP_FILES = index.docbook legal.xml
-HELP_MEDIA = \
-	figures/xed_format_bold.png			\
-	figures/xed_format_italic.png			\
-	figures/xed_format_strikethrough.png		\
-	figures/xed_format_underline.png		\
-	figures/xed_recent_files_menu_icon.png	\
-	figures/xed_window.png	
-
-HELP_LINGUAS = ar bg ca cs da de el es fi fr hu it ja ko oc pt_BR ru sv th uk zh_CN zh_HK zh_TW
-
-
--include $(top_srcdir)/git.mk

help/meson.build

@@ -0,0 +1,20 @@
+help_sources = [
+    'index.docbook',
+    'legal.xml'
+]
+
+help_media = [
+    'figures/xed_format_bold.png',
+    'figures/xed_format_italic.png',
+    'figures/xed_format_strikethrough.png',
+    'figures/xed_format_underline.png',
+    'figures/xed_recent_files_menu_icon.png',
+    'figures/xed_window.png'
+]
+
+gnome.yelp(
+    meson.project_name(),
+    sources: help_sources,
+    media: help_media,
+    symlink_media: false
+)