Window event tracking

Each window allows you to track events occurring with it (for example, its movement). Each event can have its own callback function. To do this, use the addEventListener method, which is exactly the same as the components and has the following form:

void addEventListener(const string& action, 
                      function<void(window* sender, Event* e) callback>);

Windows can track the following events:

data1 and data2 are the fields of the window structure of the Event union (for example, access to the data1 field looks like this: e->window.data1).

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