Fix dependency issue for addin to be .NET client version independent

[PrinceNebulon]

The .NET client's trace library versions have changed a couple times and this creates a dependency issue with the Addin.

• SU 6 and prior use trace libraries 1-3
• 2015R1 uses 2-0
• 2015R2 uses 2-1

I think the issue is stemming from the direct usage of the trace library in the addin to do custom tracing. Will try removing this dependency and see if that fixes the issue. It could potentially be a nested dependency from icelib, but I don't think that's the case. Just need to test and see.