qdoc: Enable support for rvalue references in function signatures

qdoc interprets the double-ampersand in function parameters
using rvalue references (e.g. 'Type &&other') incorrectly
as a logical AND operator, resulting in a syntax error.

This change works around the issue by treating '&' the same
as '*', and defining Q_COMPILER_RVALUE_REFS for qdoc.

Task-number: QTBUG-32675
Change-Id: I499611f16f22c33ff5b878da0cd59d67ddf53d72
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>
Doc: Enable documentation for QScopedPointer's rvalue ref functions

Make the documented QScopedPointer functions that take rvalue
references visible in the documentation.

Task-number: QTBUG-32675
Change-Id: If65af91d9379a6c0486e43c33434cca8505fc5c3
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>