started to seperate state and parameters, ended up doing more work on keeping private variables private

Moved bit_length from state to parameters, also added underscore to variables i felt should be private. In their corresponding gui modules i changed the implementation from accessing these variables directly to accessing them through the 'get_state' function.

Closes #20 (closed)

src/simudator/core/modules/demux.py

@@ -84,19 +84,23 @@ class Demux(Module):
     def get_state(self) -> dict[str, Any]:
         state = super().get_state()
         state["value"] = self._value
-        state["bit_length"] = self._bit_length
 
         return state
 
+    def get_parameter(self) -> dict[str, Any]:
+        parameter = super().get_parameter()
+        parameter["bit_length"] = self._bit_length
+
+        return parameter
+
     def set_state(self, state: dict[str, Any]) -> None:
         """Set the name and value of the demux.
 
         Parameters
         ----------
         state : dict[str, Any]
-            The state of the demux to load. Should contain the keys "value" and
-            "bit_length", both with values of type ``int``.
+            The state of the demux to load. Should contain the key
+            "value" of type ``int``.
         """
         super().set_state(state)
         self._value = state["value"]
-        self._bit_length = state["bit_length"]