[FLOW3-general] Same variable in every template

[Martin Lipp]

I would like to assign the same variable in every action and all 
available controllers in order to output it in the layout (all templates 
share the same layout). Is there an easy way/a best practice to do this, 
without having to assign it in every single action, which seems to 
redundant? I've thought of an ViewHelper which returns me the variable, 
but I'm not sure, if it's a good practice to add repository functions to 
a ViewHelper.

Thanks,
Martin