[MIG+REF][11] web_widget_x2many_2d_matrix

The widget has been completely refactored
to benefit from the new MVC paradigm introduced in v11.

setup/web_widget_x2many_2d_matrix/setup.py

@@ -0,0 +1,6 @@
+import setuptools
+
+setuptools.setup(
+    setup_requires=['setuptools-odoo'],
+    odoo_addon=True,
+)