lang: funcs: core: Make module names public

This is needed for when we have nested modules.

lang/funcs/core/example/flipflop_fact.go

@@ -25,7 +25,7 @@ import (
 )
 
 func init() {
-	facts.ModuleRegister(moduleName, "flipflop", func() facts.Fact { return &FlipFlopFact{} }) // must register the fact and name
+	facts.ModuleRegister(ModuleName, "flipflop", func() facts.Fact { return &FlipFlopFact{} }) // must register the fact and name
 }
 
 // FlipFlopFact is a fact which flips a bool repeatedly. This is an example fact