Fix LD <register>,<address> #27
Description
Load8FromMemoryOperation has a series of problems that need to be addressed:
LD A,(C)is unimplementedLD A,(a8)is unimplementedLD A,(a16)is unimplemented
Additionally, the types involved in the operation allow for several states that are invalid. For the sake of safety and soundness, the interface of the struct should probably be changed to only allow correct invocations of the operation.