Hardcoded MmCopyVirtualMemory size argument

[krispybyte]

Currently inside of BuildMainStack, the call to MmCopyVirtualMemory which actually performs the read/write from the game's memory, is hardcoded to size 8.

Stack->AddValue(sizeof(void*), "size");

The code can be seen here.

This is because the size argument is passed through the stack, meaning we would need some ROP gadget to write memory in there.