options: use non-generic comparison for bundle modification check

The generic QVariant comparison works badly for QList<QPointF>.

Create a comparator between two QVariants for base_value in value<tp>
ctor, using QVariant::value<tp> which returns right results once it's
converted to tp.

If a value was registered for a name in a bundle, use that comparator as
the comparator for that name. In case conflicting value types were
registered always use generic comparison for that name.

std::type_index needs to be used here since value<t> can be instantiated
in different modules (libraries), resulting in different value for the
comparator function pointer.

Move group::operator== to bundle type to avoid circular include for
connector.h.

Also use element_type more consistently in value<tp>.

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