docs: stepCountingHillClimbing in table overview + tennis play colors
improve test coverage: Simulated Annealing test + fix an unimportant bug in SA
improve test coverage: test scores
move *ScoreTest into api package
fix bug in docs + RandomUtilsTest
increase test coverage: score holder tests
PLANNER-207 SimpleBigDecimalScoreHolder and HardSoftBigDecimalScoreHolder throw NPE