Model default constructor does not initialize base Model structure members

[AlexDAlexeev]

I've found that raylib::Model class is deraived from ::Model structure.
Whe you instantiate raylib::Model with default constructor no any members of ::Model is initialized, under Visual Studio you got all of members filled with some debug non zero values.
When you try to call ~Model destructor you will try to free memory by invalid pointer.

This Code inserted anywhere in main will cause an error:

{
    raylib::Model model;
    // You'll get an exception on block exit
}

Very quick fix - add base structure initialization like this:

/**
 * Model type
 */
class Model : public ::Model {
public:
    Model() : ::Model{}
    {
        // Nothing.
    }