Segment is not working correctly

[LeanderK]

We currently don't capture the Range, but either the start or the the end of the segment (so start == end for all segments). Its usable for exemplator, but should be corrected nonetheless.

[LeanderK]

rewrote the segment-parsing. Most of it should now parse correctly, only in some cases (all the foldl) the wrong segment is give. Unfortunately we are especially interested in most of the segments of the nodes parsed via a foldl, so we need to fix this.
Also whitespaces are incorrectly added to segments, i think we need to fix the lever for this.