* Poker: Update test to exactly match the canonical data and add version file

* Change PokerTest.java,Card.java and Hand.java in order to match with canonical data and add version file.

* Correct Card.java in order to match with canonical data.

* Change indentation and correct mistakes

* Add import to PokerTest

* Fix indentation and correct mistakes

* Change variable's name from snake case to camel case

* Fix variable's name

Reference solution directory was renamed and move to the
always-excluded-from-delivery .meta folder.

Fix formatting and Intellij warnings. Remove starter implementation as
this is after the first 20 exercises. Move poker in settings.gradle so
that it's sorted alphabetically.