Enable Atlas map editor

Fixes #13

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "shared-modules"]
+	path = shared-modules
+	url = https://github.com/flathub/shared-modules

com.play0ad.zeroad.yaml

@@ -5,12 +5,14 @@ sdk: org.freedesktop.Sdk
 sdk-extensions: [org.freedesktop.Sdk.Extension.rust-stable]
 command: 0ad
 finish-args:
-  - --socket=wayland
+  # wxWidgets doesn't work yet on Wayland
+  #- --socket=wayland
+  - --socket=fallback-x11
+  - --device=shm
+  - --share=ipc
   - --device=dri
   - --socket=pulseaudio
   - --share=network
-  - --socket=x11
-  - --share=ipc
 cleanup:
   - /include
   - /lib/pkgconfig
@@ -103,14 +105,38 @@ modules:
         url: https://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz
         sha256: f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e
 
+  # Required so we can use wxWidgets with openGL integration
+  - shared-modules/glu/glu-9.json
+
+  - name: wxWidgets
+    rm-configure: true
+    config-opts:
+    - --with-gtk=3
+    - --with-opengl
+    build-options:
+      cxxflags: -std=c++11
+    sources:
+    - type: archive
+      url: https://github.com/wxWidgets/wxWidgets/archive/v3.1.3.tar.gz
+      sha256: a5cb5ea326d76b5e472e9400933cef17c900d5c9b549e40eef00b64fe86d7cb0
+      x-checker-data:
+          type: anitya
+          project-id: 5150
+          url-template: https://github.com/wxWidgets/wxWidgets/archive/v$version.tar.gz
+    - type: script
+      dest-filename: autogen.sh
+      commands:
+      - cp -p /usr/share/automake-*/config.{sub,guess} .
+      - autoconf -f -B build/autoconf_prepend-include
+
   - name: 0ad
     buildsystem: simple
     build-options:
       append-path: /usr/lib/sdk/rust-stable/bin
     build-commands:
       - cp cargo.patch libraries/source/spidermonkey/
       - echo "patch -p1 < ../cargo.patch" >> libraries/source/spidermonkey/patch.sh
-      - cd build/workspaces && ./update-workspaces.sh -j$FLATPAK_BUILDER_N_JOBS --disable-atlas
+      - cd build/workspaces && ./update-workspaces.sh -j$FLATPAK_BUILDER_N_JOBS
         --bindir=/app/bin --libdir=/app/lib --datadir=/app/share/games/0ad/ && cd
         gcc && make -j$FLATPAK_BUILDER_N_JOBS
     post-install: