Enhancement: Added special-case handling of __all__ assignments so referenced symbols are marked as accessed.
Enhancement: Added support for class declarations that include base classes that are declared in terms of a variable with a "Type[X]" type annotation.
Enhancement: Changed logic in type completion provider to sort suggestions such that dunder names (magic types) appear after other names (under the assumption that the former are more rare).
Bug Fix: Fixed bug in type completion logic that prevented members from super-classes from being included in the suggestion list.
Bug Fix: Fixed missing check in type constraint logic that resulted in an "internal error" when "is" operator was used with LHS expression that included an index.
Bug Fix: Added support in type checker for dictionary expansion entries in a dictionary literal expression.