Handle "simple" textual operations on searched and replaced names

[d-faure]

If you may count on my voice for feature request #15, I'd love to have more available string related actions in the text replace definition (which could definitively justify the remembering of complex expressions).

More precisely, in the same mood as the ${count} feature, it would seem quite natural to get additional transformation functions such as: ${upper(...)}, ${lower(...)}, ${caps(...)} and eventually more things.