features: purge all prior temporary feature bits

This commit removes all the prior temporary feature bits which were
only added in order to allow clients to gracefully continue functioning
in the midst of all the breaking changes that were landing in the
master branch of the project.

features.go

@@ -8,8 +8,4 @@ var globalFeatures = lnwire.NewFeatureVector([]lnwire.Feature{})
 
 // localFeatures is an feature vector which represent the features which
 // only affect the protocol between these two nodes.
-var localFeatures = lnwire.NewFeatureVector([]lnwire.Feature{
-	{Name: "lcp-stop-and-wait", Flag: lnwire.RequiredFlag},
-	{Name: "48-bit-state-hint", Flag: lnwire.RequiredFlag},
-	{Name: "shachain", Flag: lnwire.RequiredFlag},
-})
+var localFeatures = lnwire.NewFeatureVector([]lnwire.Feature{})