Fix VZip checksum behaviour
Refactored NetFilter into a variable guarded by netLock
Guard against multiple Connect calls
Update Dota 2 protobufs [ci skip].
Regen Dota 2 protos.
Update changes.txt, AssemblyVersion and nuspec to 1.6.1
Remove Connection change from release notes - not exposed to consumers
Update CS:GO, Dota 2 Test, Dota 2 protobufs [ci skip]
Regen CS:GO, Dota 2 protobufs
Update EMsg and protobufs
Regen SteamLanguage and client protobufs