- added Msg frame work with Msg container , Msg sources, Msg sinks

- added filter by message type to nmea receiver
- show case new features in MultiClient.main()

msg_montainer.py

@@ -0,0 +1,13 @@
+
+
+class MsgContainer:
+	def __init__(self, name: str, timestamp: float = 0, data: bytes = b''):
+		self.name : str= name
+		self.timestamp : float = timestamp
+		self.data: bytes = data
+
+	def __str__(self):
+		return f"{self.name}: {self.timestamp}: {self.data}"
+
+	def __repr__(self):
+		return f"{self.name}: {self.timestamp}: {self.data}"