Removed old router property code as it is no longer needed when
SessionCommand class used by the Backend class is taken into use.
Removed unnecessary code that is implemented as a part of the Backend
class.
Changed functions to return references to Backends instead of handling raw
DCBs. This introduces a few cases where the code returns a reference when
no reference is actually available. These cases are solved by having an
empty static shared_ptr that is returned in these cases. This is done to
silence any compiler warnings that returning references to local variables
would bring as these should never happen if the code is functioning
properly.
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