Allow iterative generation

[alem0lars]

We should be able to map a single source into multiple targets during incarnation.

Usage example in meta.yml:

  <% var!(:peers).each do |peer| %>
    <%# here declare specific stuff that should be available in the template for current iteration %>
  - src:  ^peer$
    dst:  /etc/ppp/peers/<%= peer[:name] %>
    only: f?ppp
  <% end %>

Every incarnation should have specific variables set for the current iteration.

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