Bring Memory view vidget back.
Make CMake search for OktetaCore and OktetaGui.
Change the widget to use Okteta ByteArrayModel and ByteArrayColumnView
Minor code cleanup including:
- Converted to new signal and slot syntax
- fix include guard
- prepend membervars with m_
- adapt to interface changes in kdevelop/debuggers
- Use configure-time CMake for define