Get all ActionController partial rendering to use ActionView's partial code. Consequences:

  * It is not possible to always pre-determine the layout before going to ActionView.
    This was *already* broken for render :partial => @object, :layout => true. This is
    now handled by overriding render_to_body in layouts.rb and manually injecting the
    partial's response. This needs to be done in ActionController since ActionController
    knows enough to get _layout_for_option. There is probably a better abstraction here.
  * As a result, all partial rendering can correctly restrict their layouts to the mime
    type of the rendered partial. This could have previously caused a bug in some edge cases.
  * If other layout-like options are added, they might need to add special code for the
    case of render :partial. We should try to think of an alternate solution, if possible,
    but this works for the cases we know of now.

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