Release v0.7.0

• (Apollon77) Introduce close method to tear down all connections that are potentially open
• (Apollon77) Use a persistent connection by default to prevent the need to verify the pairing for each call. Can be disabled using a new options parameter in constructor. You must call close() if you do not need the instance any longer
• (Apollon77) Make sure calls on a http connection are queued to not overlap
• (Apollon77) check ble status before start a new scanning process
• (Apollon77) remember that scanning was stopped when stop() is called
• (Apollon77) Fix pot. hanging response if multiple subscriptions are done on same device
• (Apollon77) Deprecate "GattConnection.iPeripheralConnected" in favor of a unified "isConnected" for BLE and HTTP connections
• (Apollon77) Prevent parallel pair verify calls by queuing them
• (Apollon77) Convert all examples to async/await for better readability and add close calls