Previously, the behavior was different depending on if the
contentDescription was calculated as a result of an event, or if it was
calculated as a result of hierarchy traversal.
Refactor the functionality into one single function that will be used in
both scenarios.
'contentDescription' will now receive its value from one of the following
sources, listed in prioritised order (QAI == QAccessibleInterface):
1. QAI::text(QAccessible::Name)
2. QAI::text(QAccessible::Description)
3. QAI::text(QAccessible::Value)
4. QAI::valueInterface()->currentValue()
Change-Id: I2e4958a1e95b5f20d01da37c23ecbc09842360bc
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>