Bring memory view back Summary: Bring the memory view widget back into a compilable state. Make CMake search for OktetaGui. Change the widget to use Okteta ByteArrayModel and ByteArrayColumnView Fix char* memleak - use QByteArray instead Use configure-time CMake for define

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

Reviewers: KDevelop, mwolff

Reviewed By: KDevelop, kossebau, mwolff

Subscribers: kossebau, mwolff, kdevelop-devel

Differential Revision: https://phabricator.kde.org/D4232