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Server: Add onSubscribe() callback for characteristics. Adds a new method to NimBLECharacteristicCallbacks that gets called when a client changes it's subscription status. * Remove NimBLE2902 class. As the NimBLE2902 class usefulness was only related to callback functions that were replaced by the NimBLECharacteristicCallbacks:onSubscribe() method this removes the NimBLE2902 class and moves all subscription handling to NimBLECharacteristic. * Update documents and examples to reflect this change. * Add getSubscribedCount() to get the number of subscribed clients.