Copy and Clone methods

[petervaro]

The framework should provide .copy() and .clone() methods on every Sensor objects, to make it easier to create new instances with similar properties. Similar means, when cloning an instance, everything except the callbacks should be copied, and the Context should be explicitly set (== clone-to-context).

• clone will invoke new internally => suitable for duplicating statically alloc'd objects
• copy will invoke ini internally => suitable for duplicating dynamically alloc'd objects

Example: Create 1 Manager; 3 Contexts; and 3 LED objects, each of which handles the same LED hardware (connected to the 3rd pin).

kb_Manager      *manager;
kb_rpi2_Context *context1,
                *context2,
                *context3;
kb_sensors_LED  *kb_led1,
                *kb_led2;  // this is dynamic
MyLED            my_led;   // this is static

kb_Manager_new(&manager);
kb_rpi2_Context_new(&context1, manager);
kb_rpi2_Context_new(&context2, manager);
kb_rpi2_Context_new(&context3, manager);
kb_sensors_LED_new(&kb_led1, context1, kb_rpi2_PIN3);
kb_sensors_LED_clone(kb_led1, &kb_led2, context2);
kb_sensors_LED_copy(kb_led1, (kb_sensors_LED *)&my_led, context3);
// now after the 'casted' copy, we should set special values to MyLED if needed..

// now we can work with the same LED hardware in the 3 contexts separately