Introduced EqualsGuidelinesTestFixture for testing overrides of Equals() implementations - Improved Equals test fixture implementations: -- Moved factory methods inwards: no need to expose them while they're only being used in the EqualsTests -- Added random offset for the unequal test cases instead of a 'magic' constant - Reverted Equals method from comparing count and then its content by SequenceEquals Related to Issue [WTI-1390]