update gate interface for new protected port functionality

sim/gate.lua

@@ -16,10 +16,30 @@ function Gate:addport(port)
 	port.gate = self
 end
 
+function Gate:getportstate(index)
+	return self.ports[index].state
+end
+
 function Gate:setportstate(index, state)
 	self.ports[index]:setstate(state)
 end
 
+function Gate:initdata()
+	self.data = {}
+end
+
+function Gate:getdata()
+	return self.data
+end
+
+function Gate:getportisrising(index)
+	return self.ports[index]:isrising()
+end
+
+function Gate:getportisfalling(index)
+	return self.ports[index]:isfalling()
+end
+
 -- function Gate:cb(...)
 -- 	local args = {...}
 -- 	local str = tostring(#args)