CPP1115 — _default_POA should use override

The operation _default_POA currently declared as

IDL::traits<PortableServer::POA>::ref_type _default_POA()

Should be

IDL::traits<PortableServer::POA>::ref_type _default_POA() override

Also the formatting of the constructor of the TIE template should be changed, hard to read. Initializing the members could use std::move so change

: tied_object_(t), poa_(poa)

to

: tied_object_(std::move(t)), poa_(std::move(poa))

Updated code for Delegation-Based Interface Implementation

Update code to reflect C++ best practices