move voicemeetertype(), voicemeeterversion() and samplerate() properties into VbanPacket

add NamedTuples for Levels, Labels and States.

refactor the levels properties

update the math in util.comp()

StripLevel/BusLevel getters updated according to changes in VbanPacketNBS0

remove {VbanCmd}._get_levels(), it's no longer necessary.

vban_cmd/vbancmd.py

@@ -5,7 +5,7 @@ import threading
 import time
 from pathlib import Path
 from queue import Queue
-from typing import Iterable, Union
+from typing import Union
 
 from .enums import NBS
 from .error import VBANCMDError
@@ -184,17 +184,6 @@ class VbanCmd(abc.ABC):
         while self.pdirty:
             time.sleep(self.DELAY)
 
-    def _get_levels(self, packet) -> Iterable:
-        """
-        returns both level arrays (strip_levels, bus_levels) BEFORE math conversion
-
-        strip levels in PREFADER mode.
-        """
-        return (
-            packet.inputlevels,
-            packet.outputlevels,
-        )
-
     def apply(self, data: dict):
         """
         Sets all parameters of a dict