allow advanced templates in repeat blocks

[nineinchnick]

Allows to call methods on items in repeat blocks (notice item.target.display_name:call):

{findings:repeat:|{{item.target.display_name:call}}|{{item.id}}|{{item.description}}|{{item.severity}}|{{item.details}}|{{item.mitigations}}|{{item.example}}|{{item.references}}
}

We could use the property decorator but there's no reason why the slightly more advanced template format shouldn't be supported in the repeat block.

[ghost]

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[izar]

Thanks!