Fix ScopeProvider and remove LinkingService

[joeseibel]

The scope provider was not completely updated after the addition of EMV2PropertyAssociation. For example, the scoping rule scope_EMV2PathElement_namedElement does not include all elements that can be referenced. There are also problems with the linking service now. For example, enumeration literals cannot be resolved by the linking service for enumeration properties. I would assume that the same applies to unit literals as well. The scope provider should be thoroughly implemented and the linking service thrown away.

[joeseibel]

Linking service was removed in a9188b0. The completion of the scope provider was done from 426dc2b to 9b5f56e.