message: python2 compatibility: hdlAst types: inherit from object class
diff: @@ -16,7 +16,7 @@ Main container is HdlContext which can store all other objects.
  """
  -class CodePosition():
  +class CodePosition(object):
  __slots__ = ["startLine", "stopLine", "startColumn", "stopColumn"]
  def __init__(self, startLine, stopLine, startColumn, stopColumn):
  @@ -43,14 +43,14 @@ class HdlName(str):
  __slots__ = []
  -class HdlAll():
  +class HdlAll(object):
  """
  Constant which corresponds to VHDL "all" keyword or "*" in verilog sensitivitylist
  """
  __slots__ = []
  -class HdlTypeType():
  +class HdlTypeType(object):
  """
  Type which means that the object is type of type
  """
  @@ -65,7 +65,7 @@ HdlTypeEnum = Enum
  # arrays are described as HdlCall(HdlBuildinFn.INDEX, (type, array size))
  # [TODO] HdlTypeStruct/Union
  -class HdlTypeBits():
  +class HdlTypeBits(object):
  """
  The type which represents bit or bit vector in HDL (std_logic/_vector in VHDL [0:8] in verilog)
  @@ -88,14 +88,14 @@ class HdlTypeBits():
  and self.signed == other.signed)
  -class HdlTypeAuto():
  +class HdlTypeAuto(object):
  """
  Type which means that the type is automatically resolved from the type of the value
  """
  __slots__ = []
  -class iHdlObj():
  +class iHdlObj(object):
  """
  Object with direct represenation in HDL
  @@ -107,7 +107,7 @@ class iHdlObj():
  self.doc = "" # type: str
  -class HdlIntValue():
  +class HdlIntValue(object):
  """
  Object for represenation of int value in in HDL (= also for the bitstrings)
  """
  @@ -191,7 +191,7 @@ class HdlBuildinFn(Enum):
  # note that in verilog bitewise operators can have only one argument
  -class HdlCall():
  +class HdlCall(object):
  """
  Container for call of the HDL function in HDL code
  """
  @@ -213,7 +213,7 @@ class iHdlObjWithName(iHdlObj):
  self.name = None # type: HdlName
  -class iInModuleHdlObj():
  +class iInModuleHdlObj(object):
  """
  Object which can apear in the module body
  """
  @@ -457,7 +457,7 @@ class HdlContinueStm(iHdlStatement):
  __slots__ = []
  -class HdlContext():
  +class HdlContext(object):
  """
  The container of the objects specified in HDL files
  