Simplifying defining Q_PROPERTY()

This is the simplest of the macros, PROPERTY. It takes a data Type and the Name of the property, then takes care of not only generating the Q_PROPERTY statement, but also the required getter and setter methods:

/**
 * @def PROPERTY(Type, Name)
 *
 * @brief   A macro to define a class "Property" (Q_PROPERTY).
 * @param   Type    - the type of the property
 * @param   Name    - the name of the property
 *
 * This macro defines a Q_PROPERTY, its storage, and the required getter and
 * setter methods.  This allows the property to be accessed by through the
 * QObject or Q_GADGET system.  It also makes importing and exporting the class
 * to XML Streams very easy as the property system does most of the work for you.
 *
 * @note    This can only be used with a class that inherits from QObject or Q_GADGET
 */
#define PROPERTY(Type, Name)  ...