Fixed #32 : concept groups are not correctly updated

Fixed #35 : Refactor test helper class (CNC, CC, CIO)
Fixed #36 : Concept values are not used when declared with variable expression
Fixed #37 : Objects in memory lose their values are restart
Fixed #38 : func(a=b, c) (which is not allowed) raise an exception

src/core/global_symbols.py

@@ -31,6 +31,9 @@ class CustomType:
     def __eq__(self, other):
         return isinstance(other, CustomType) and self.value == other.value
 
+    def __hash__(self):
+        return hash(self.value)
+
 
 class NotInitType(CustomType):
     def __init__(self):
@@ -63,3 +66,6 @@ class ErrorObj:
     To indicate that somehow, the underlying object is (or has) an error
     """
     pass
+
+
+CURRENT_OBJ = "__obj"