Easy use CSS bundle for each interfaces

By using for desktop interface:
@import 'gmf/controller/desktop.css'
in you CSS file.

package.json

@@ -16,9 +16,10 @@
     "dist": "TARGET=dist webpack --mode=production --progress",
     "dist-spinner": "svgo --config=svgo.js src/icons/spinner.svg --output=dist/spinner.svg",
     "distlib": "tsc --pretty",
-    "distlib-css": "copyfiles --verbose src/**/*.css src/*.css src/**/*.scss src/*.scss distlib",
     "distlib-images": "copyfiles --verbose src/**/*.svg src/*.svg src/**/*.png src/*.png distlib",
-    "prepare": "npm run dist && npm run dist-spinner && npm run distlib && npm run distlib-css && npm run distlib-images",
+    "distlib-css": "copyfiles --verbose src/**/*.css src/*.css src/**/*.scss src/*.scss distlib",
+    "distlib-css-bundle": "cp dist/desktop-*.css distlib/src/controllers/desktop.css && cp dist/mobile-*.css distlib/src/controllers/mobile.css && cp dist/iframe_api-*.css distlib/src/controllers/iframe_api.css",
+    "prepare": "npm run dist && npm run dist-spinner && npm run distlib && npm run distlib-images && npm run distlib-css && npm run distlib-css-bundle",
     "typecheck": "tsc --project tsconfig-all.json --noEmit",
     "doc": "typedoc",
     "build-storybook": "TARGET=ngeo-examples storybook build --output-dir=.build/storybook",