Fill feature expressions/pattern/Pattern2

[hvub]

This PR aims at providing scenarios for the so far empty feature expressions/pattern/Pattern2.

[hvub]

• size(<pattern>) is deprecated
• this PR should:
  • Write CIP
  • remove pattern/Pattern2
  • rename pattern/Pattern3 to pattern/Pattern2
  • add scenario on size(<pattern comprehension>) to list/List6
  • add failing scenario on size(<pattern>) to list/List6

[hvub]

Ad "add scenario on size(<pattern comprehension>) to list/List6":

The scenarios pattern/Pattern3.[4], pattern/Pattern3.[7]–[9] testing on size(<pattern comprehension>). I will simply move them over to list/List6. The scenarios are not picture-prefect and could be improved. Let's not do this now, but rather as a part of improving/completing list/List6 whenever that comes up.

[hvub]

Thanks @Mats-SX, though in general I have to say, I did not came up with these scenarios, they existed already (in Pattern3). They certainly can be improved. However, that is not the aim of this PR. This PR aimed at providing scenarios for size(<pattern>) (originally Pattern2) which turned out to be deprecated. Hence, this PR removes the feature Pattern2 provisioned for size(<pattern>) and renames Pattern3 to Pattern2.

Anyway, some improvements have be made. More can be made at some later stage. At the moment, we try to focus on filling complete empty features.

[Mats-SX]

@hvub Thanks a lot! Happy to approve this :)