Step 2.2: Move empty constructor/destructor definitions to header

Enhance simplicity - one can know that they are empty just by
looking at the header.
Step 2.3: Move non-interface operations to MockExpectedFunctionCall
Step 2.4: Move non-interface operations to CheckedMockActualFunctionCall
Step 3.1.1: Rename MockExpectedFunctionCall to MockCheckedExpectedCall
Step 3.1.2: Rename CheckedMockActualFunctionCall to MockCheckedActualCall
Step 3.2.1: Move MockFunctionCallComposite to MockExpectedFunctionCall
Step 3.2.2: Rename MockFunctionCallComposite to MockExpectedCallComposite
Step 3.3: Move MockIgnoredCall to MockIgnoredExpectedCall