[IMP] web: add option to display a banner above a view

Add a banner_route attribute to AbstractView to allow fetching html from a
controller route and displaying it above the view.

The initial use case was the onboarding panels.

Supported views are the ones inheriting both AbstractView and AbstractController.

1 files changed, 5 insertions, 0 deletions

diff --git a/addons/web/static/src/scss/banner.scss b/addons/web/static/src/scss/banner.scss
new file mode 100644
index 00000000000..b119d9ab273
--- /dev/null
+++ b/addons/web/static/src/scss/banner.scss
@@ -0,0 +1,5 @@
+.o_has_banner {
+    .o_view_nocontent {
+        top: 30%;
+    }
+}