Make types public

[marco-bertschi]

• CreateInstanceOfTypeStrategy

• GenericCopyStrategy

• CopyCallContext

• IConvertHelper

• ICopyHelper

• CopyCrossReferencedCounterPartDeterminationHelper

• GenericCreateByBaseAsCriterionStrategy

• Also, the convert operation interfaces must be public so they can be mocked while testing.

[marco-bertschi]

Closed, is covered by #45