Add the manifest version 2 to be usable by CEF

[Lecrapouille]

@xigh

Compiler cefclient (Linux) apres notre build.py:

cd '$WORKSPACE_STIGMEE/godot/gdnative/browser/thirdparty/cef_binary/build'
ninja -j8 cefclient

Lancer l'extension donnée en exemple de cefclient:

cd $WORKSPACE_STIGMEE/godot/gdnative/browser/thirdparty/cef_binary/build/tests/cefclient/Release/
./cefclient --use-views --load-extension=$WORKSPACE_STIGMEE/godot/gdnative/browser/thirdparty/cef_binary/tests/cefclient/resources/extensions/set_page_color/

On doit voir une icone un carré coupé en 4 parties: rouge, bleue, jaune, vert.

Lancer l'extension Stigmark avec cefclient:

./cefclient --use-views --load-extension=$WORKSPACE_STIGMEE/packages/stigmark/ext/chrome-edge-brave/

elle ne doit pas marcher avec le manifeste qui est en version 3. Quand je le remplace par le manifest v2 suivant, ca fonctionne
workspace_stigmee/packages/stigmark/ext/chrome-edge-brave/manifest.json

{
  "name": "A browser action with a popup that changes the page color",
  "description": "Change the current page color",
  "version": "1.0",
  "permissions": [
    "tabs", "http://*/*", "https://*/*"
  ],
  "browser_action": {
      "default_title": "Set this page's color.",
      "default_icon": "icons/BMButton.png",
      "default_popup": "popup.htm"
  },
  "manifest_version": 2
}