register project listeners before loading addOns, so we can prepend listeners

--HG--
extra : rebase_source : bb30e5e2ab67d966ae1432ab0d0fe49be173096d
Backed out changeset: be9f8af815c2

This causes problems with existing codebases, so let's not change the old
behaviour. If you really need listeners to be in front of others, use another
way of adding them and use the $prepend parameter on the dispatcher.