New (sub-)inspection: Masking exceptions

[mccartney]

Amending the SwallowedException inspection to check also against masked exceptions (maybe the inspection should be renamed then?), e.g.

object Test {
    try {
        println(Integer.valueOf("asdf"))
    } catch {
        case nfe: NumberFormatException =>
            throw new IllegalArgumentException("not a number")
    }
}

hides the real cause of the exception thrown. Thus caused-by section doesn't appear in the eventual stack trace