feature: add support for Coccinelle-like semantic patches mixing matching (TemplateMatcher) and transformation (Template) together

Imagine that you want to match a code location and transform it at the same time, this is sometimes called a "semantic patch" (as opposed to a line-based patch).

In the C world, there is an excellent tool for this, called Coccinelle, see http://coccinelle.lip6.fr/.

In Spoon, it would mean creating an abstraction that would gather a `TemplateMatcher` and `Template` in a same object. In other terms, we are really close to have "semantic patches" in Spoon.

@pvojtechovsky since you're extensively working on this part, what do you think?