Re-design of submodules used in blender.git

This commit implements described in the #104573.

The goal is to fix the confusion of the submodule hashes change, which are not
ideal for any of the supported git-module configuration (they are either always
visible causing confusion, or silently staged and committed, also causing
confusion).

This commit replaces submodules with a checkout of addons and addons_contrib,
covered by the .gitignore, and locale and developer tools are moved to the
main repository.

This also changes the paths:
- /release/scripts are moved to the /scripts
- /source/tools are moved to the /tools
- /release/datafiles/locale is moved to /locale

This is done to avoid conflicts when using bisect, and also allow buildbot to
automatically "recover" wgen building older or newer branches/patches.

Running `make update` will initialize the local checkout to the changed
repository configuration.

Another aspect of the change is that the make update will support Github style
of remote organization (origin remote pointing to thy fork, upstream remote
pointing to the upstream blender/blender.git).

Pull Request #104755

scripts/templates_py/operator_node.py

@@ -0,0 +1,66 @@
+import bpy
+
+
+def main(operator, context):
+    space = context.space_data
+    node_tree = space.node_tree
+    node_active = context.active_node
+    node_selected = context.selected_nodes
+
+    # now we have the context, perform a simple operation
+    if node_active in node_selected:
+        node_selected.remove(node_active)
+    if len(node_selected) != 1:
+        operator.report({'ERROR'}, "2 nodes must be selected")
+        return
+
+    node_other, = node_selected
+
+    # now we have 2 nodes to operate on
+    if not node_active.inputs:
+        operator.report({'ERROR'}, "Active node has no inputs")
+        return
+
+    if not node_other.outputs:
+        operator.report({'ERROR'}, "Selected node has no outputs")
+        return
+
+    socket_in = node_active.inputs[0]
+    socket_out = node_other.outputs[0]
+
+    # add a link between the two nodes
+    node_link = node_tree.links.new(socket_in, socket_out)
+
+
+class NodeOperator(bpy.types.Operator):
+    """Tooltip"""
+    bl_idname = "node.simple_operator"
+    bl_label = "Simple Node Operator"
+
+    @classmethod
+    def poll(cls, context):
+        space = context.space_data
+        return space.type == 'NODE_EDITOR'
+
+    def execute(self, context):
+        main(self, context)
+        return {'FINISHED'}
+
+
+def menu_func(self, context):
+    self.layout.operator(NodeOperator.bl_idname, text=NodeOperator.bl_label)
+
+
+# Register and add to the "Node" menu (required to also use F3 search "Simple Node Operator" for quick access).
+def register():
+    bpy.utils.register_class(NodeOperator)
+    bpy.types.NODE_MT_node.append(menu_func)
+
+
+def unregister():
+    bpy.utils.unregister_class(NodeOperator)
+    bpy.types.NODE_MT_node.remove(menu_func)
+
+
+if __name__ == "__main__":
+    register()