_disableAccessibilityState

[danielghost]

It looks like this attribute is missing from the core schemas except for component.model.schema.

adapt-contrib-boxMenu:
Should _disableAccessibleState be changed to _disableAccessibilityState for consistency with other models. Also missing from the schema.

[oliverfoster]

We're probably going to drop _disableAccessibleState in favour of _isA11yCompletionDescriptionEnabled.

_disabledAccessibleState is really now _shouldRenderHeaderViews.

https://github.com/adaptlearning/adapt_framework/search?q=_disableAccessibilityState&unscoped_q=_disableAccessibilityState

https://github.com/adaptlearning/adapt_framework/search?q=_isA11yCompletionDescriptionEnabled&unscoped_q=_isA11yCompletionDescriptionEnabled

[moloko]

partial duplicate of #190

[oliverfoster]

removed in #247