Added graphics of memory layout

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Added image of processor pipeline

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Added image of memory access

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Added more C++ tips and cleanups

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>