Treat primitives and their autoboxed types as one and the same

Following on from this comment:

I think we should treat Integer and int as one type.

Each instance of a primitive and its respective autoboxed type should count as the same type. For example:

public String doSomething(int id, Integer other);

We should coalesce int and Integer into a single type for analyses, so our metrics should calculate the total parameter types (both input and output) for this method as 2 instead of 3.

[yegor256]

@llorllale @amihaiemil how about we create one more layer between skeleton.xml and LCOM.xsl, which will include a number of XSL stylesheets. One stylesheet will merge/coalesce types. Another one will remove ctors. Another one will remove static methods, and so on. That will help us get rid of code duplication inside XSL and will make the entire architecture composable: we can use certain XSL layers or ignore them. WDYT?

[yegor256]

@llorllale @amihaiemil I fixed the puzzle in #166 and removed it from the source code. Now we have XSL layers. We have just two of them: for removal of ctors and remove of static methods. If you need more, feel free to report bugs/tickets.