Add tests cases that interact with conditional compilation

[LegalizeAdulthood]

Conditional compilation is just a fact of life in C++. However, lots of refactoring tools can't see into all the alternatives of a conditional compiled block of code. Add tests for refactorings that exercise conditionally compiled code.

• Add Block Delimiter
• Add Override
• Add Parameter
• Change Signature
• Create Overload
• Create Setter Method
• Extract Constant
• Extract Function
• Extract Method
• Extract Parameter
• Extract Variable
• Flatten Conditional
• Inline Macro
• Inline Recent Assignment
• Inline Result
• Inline Variable
• Make Method Static
• Move Implementation to Source File
• Move Method
• Optimize Namespace References
• Remove Block Delimiter
• Remove Unused Parameter
• Rename
• Reorder Parameters
• Replace If With Ternary
• Replace Iterative For With Range For
• Replace NULL/0 with nullptr
• Replace String Literal with Raw String Literal
• Replace Ternary With If
• Replace Type With Auto
• Replace auto_ptr With unique_ptr
• Reverse Conditional
• Simplify Boolean Expression
• Split Initialization From Declaration
• Split Multi-Variable Declaration

[LegalizeAdulthood]

Idea for how to add this to the existing suite:

1. Use a CMake variable to define the conditionally compiled variant
2. Create variant targets for the test case libraries and the test suite executable
3. Use a variant configuration headers (e.g. config.h) in two different directories to define the two variants.
4. Use the CMake variable to adjust the include search location to select one of the two variants.
5. Add #ifdef preprocessor directives to source files to identify variant cases.