Add generic solarus app

snap/gui/solarus.desktop

+[Desktop Entry]
+Version=1.0
+Type=Application
+Name=Solarus
+GenericName=ARPG game engine
+Comment=A free and open-source Action-RPG game engine
+Exec=solarus-launcher
+Icon=${SNAP}/share/icons/hicolor/256x256/apps/solarus.png
+Terminal=false
+NoDisplay=true
+StartupNotify=true
+Categories=Game;Development;AdventureGame;IDE;

snap/snapcraft.yaml

@@ -10,6 +10,15 @@ description: |
 confinement: strict
 
 apps:
+  solarus:
+    command: desktop-launch solarus-launcher
+    plugs:
+      - desktop
+      - desktop-legacy
+      - home
+      - opengl
+      - pulseaudio
+      - x11
   launcher:
     command: desktop-launch solarus-launcher
     desktop: share/applications/solarus.desktop