Investigate possibility to fix incompatible licenses

[mpostol]

According to the current README

## License Model ##

The ModelCompiler code is MIT license, however, it links to the UA-.NETStandard NuGet packages which is covered under the OPC Foundation Redistributables licence. If a user chooses the version that links directly to the  UA-.NETStandard submodule then the license the UA-.NETStandard dual license applies.

Try to define an abstraction to remove dependency on the UA-.NETStandard.

This issue was derived from OPCFoundation#74

[mpostol]

Further development will be conducted on the branch UANodeSetRemoveDependency.