[WIP] Fix #324 - check for more than one consecutive empty lines

[wilzbach]

#Hmm, it seems that comments aren't part of the token stream even with CommentBehavior.intern as they are always removed by the lexer.

Any ideas how I could do this check without access to the raw source code, then?

For reference, the code currently prints:

typevoid line: 2
typeidentifier line: 2
type( line: 2
type) line: 2
type{ line: 2
type} line: 2
typevoid line: 5
typeidentifier line: 5
type( line: 5
type) line: 5
type{ line: 5
type} line: 5
typevoid line: 2
typeidentifier line: 2
type( line: 2
type) line: 2
type{ line: 2
type} line: 2
typevoid line: 5
typeidentifier line: 5
type( line: 5
type) line: 5
type{ line: 5
type} line: 5

[wilzbach]

(Rebased)

[ghost]

I'm doing a bit of cleanup and close this since it's been abandoned.