Step 5.3: Remove MockFunctionCall
Step 6.1: Separate MockExpectedCall interface
Step 6.2: Rename MockExpectedFunctionCall.h MockExpectedCall
Step 6.3: Seperate MockActualCall interface
Step 6.4: Rename MockActualFunctionCall.h to MockActualCall.h
Use of interfaces in MockSupport.h

...and implementation in MockSupport.cpp