Add a VirtualFunctionTableHook class in Vezel.Ruptura.Memory

[alexrp]

This API should allow reading an existing virtual function table and replacing specific entries, as well as creating one from scratch. There should be support for replacing an existing table in an image, and for replacing the table pointer of a single object instance.

[alexrp]

Need to think a bit more about how to design this. As with regular hooking, we'd want to go through the hook gate for safety reasons. But the hook gate is currently pretty closely coupled with FunctionHook, and a FunctionHook makes no sense when replacing a virtual table entry.

[alexrp]

Another thing to consider: Should we have special support for multiple inheritance?

[alexrp]

Another thing to consider: Should we have special support for multiple inheritance?

No. Having done some RE on a binary using multiple inheritance lately, I can safely say it's too complex and compiler-specific to be worth specially supporting. As long as the VirtualFunctionTableHook API is designed sensibly, it will work for MI with a few extra steps anyway.