QDoc: Allow QDoc to collect all QML basic types in a map.

-needed if a list of just QML basic types is needed.
-adding QML basic types to map of QML types.
-generating the list of "qmlbasictypes" also now supported.
-part of the fix for QTBUG-32871

Change-Id: Id291982a5684645b2b5e75256be673c1701e60b1
Task-number: QTBUG-32871
Reviewed-by: Martin Smith <martin.smith@digia.com>