Bugs found during development of PyQt v6.7.0

[philthompson10]

The development of PyQt v6.7.0 is the first major use of the refactored MetaSIP. This issue corresponds to all the bugs found during that development.

• Clicking Hide Ignored in the context menu of a .sip file causes a crash because of an unrefactored attribute name.
• The dialog used to specify the version range of an API item crashes because of an undefined attribute.
• The version range of an API item is not updated on the screen after using the version dialog (although it is updated in the project file).
• The callable properties dialog crashes because of an attribute error setting the window title.
• The callable properties dialog crashes because of an attribute error when save the values.
• The signature of an API item is not updated when %MethodCode is specified.
• Adding manual code doesn't update the GUI.
• New manual code isn't marked as Unchecked or given an appropriate version range.
• Deleting an API item doesn't update the GUI.
• A newly scanned class variable can be given the wrong initial status.
• The context menu for methods is missing the access specifiers.
• The argument properties dialog crashes when setting the KeepReference annotation.
• Deleting a .sip file doesn't update the GUI.
• Inserting a file into the external editor crashes because of the use of a PyQt5-style enum.