* 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
With the toolbar icons converted to symbolic icons we now have a mix of symbolic
and non-symbolic icons in the menu since they share the same GtkAction's.
Convert the remaining actions along with a couple that are placed in the menu
by plugins to use symbolic style icons.