Some work-in-progress stuff and many comment updates

src/environment.h

@@ -112,6 +112,19 @@ class ActiveBlockList
 private:
 };
 
+/*
+	Active block modifier interface
+*/
+
+class ActiveBlockModifier
+{
+public:
+	ActiveBlockModifier(){};
+	virtual ~ActiveBlockModifier(){};
+	//TODO
+	//virtual void 
+};
+
 /*
 	The server-side environment.