Doc: Fix documentation issues for event and input device classes

* Document the new base classes QPointerEvent and QSinglePointEvent,
  and move relevant documentation to be located under them.
* Replace linking to deprecated functions with their new counterparts.
* Remove non-existent function and parameter documentation.
* Document QEventPoint::State enum.
* Prefer \obsolete over \deprecated and fix the usage.
* Document the Capabilities enum in the correct location and
  add docs for the missing enum values.

Change-Id: Ic8f2732f2e90ecbf522cd744c601cedcc574825c
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

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