Implement QMetaTypeSwitcher.

Currently one of the most common coding pattern, when working with
QMetaType types, is to switch over all types ids to convert a given
type id to a real c++ type. The pattern is not perfect, because of:
- code duplication - to convert type id to a real type a user has to
write own switch case
- maintenance - adding new type to QMetaType::Types doesn't propagate
to other parts of code.

Proposed type switcher can solve the issue by switching type id and
delegating found c++ type.

The class is created for internal use only and was created to simplify
common problems in QtDeclarative, QtScript and QVariant.

Change-Id: I0567ef908024b3b05ee18126f98a73a74748fbd2
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

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