Resolve "Replacing Operations in SFG"

I added some thoughts on how this issue was implemented in #15 (closed), for most part on how we handle replacing several operations. Closes #15 (closed)

b_asic/signal_flow_graph.py

@@ -350,6 +350,18 @@ class SFG(AbstractOperation):
             input_values.append(self._evaluate_source(input_src))
         return src.operation.evaluate_output(src.index, input_values)
 
+    def replace_component(self, component_type, _id=None, _type=None):
+        """Find and replace all components matching either on GraphID, Type or both.
+        Then return a new deepcopy of the sfg with the replaced component.
+
+        Arguments:
+        component_type: The type of the new component, e.g Multiplication
+    
+        Keyword arguments:
+        _id: The GraphID to match the component to replace.
+        _type: The Type to match the component to replace.
+        """
+        pass
     
     def __str__(self):
         """Prints operations, inputs and outputs in a SFG