Add degree<->radians conversions for long double and integral types

For long double: they're just missing, so add them for completeness.

For integral types: follow the advice of C11's trigonometric
functions; first convert the angle to double, then do the actual
conversion. This is offered only for the degree->radians conversions,
as someone may legitimately want to call e.g. qDegreesToRadians(90).

On the other hand, it seems extremely unlikely that someone may
want to do a radians->degree conversion starting from integral
datatypes, so I'm not adding it for the moment being (instead,
I'm leaving a note).

[ChangeLog][QtCore][QtMath] qDegreesToRadians now also accepts
long double and integral types. A value of integral type will be
casted to double before the conversion to radians.

[ChangeLog][QtCore][QtMath] qRadiansToDegrees now also accepts
long double.

Change-Id: Ib1576be5193ae09bb6cb4a70d7a31702955df2c5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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