Minor code and memory initialization fixes

* Explicitly initialize member variables in SELFDecrypter, MemInfo, and
VirtualMemoryBlock
* Zero out memory used for counter/nonce in aes-ctr
* Fix use of a ControlInfo pointer after it is added to an Array via
Array::Move (which makes it an invalid pointer) in
SELFDecrypter::LoadHeaders
Merge pull request #130 from nohbdy/bugfix

Minor code and memory initialization fixes