re-enable support for resolving conflicts across orders

This feature was silently dropped in Pyramid 1.4 when deferred
discriminators were added.

It is re-introduced such that it's possible to override an action in
order X by defining an action in order Y where Y <= X with a
non-conflicting includepath.

This also takes special care to avoid undeferring the discriminator for
an action until the execution engine is ready to start executing
actions of the same order. This gives time for required actions to
execute prior, allowing the discriminator to depend on earlier actions.

fixes #2697

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