ENH: Only re-scan for available devices if it's been >15s since the last scan #19
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This makes it faster to call
DeviceManager.getAvailableDeviceswith a list of Cedrus device classes, as each one won't callpyxid2.get_xid_devices(which can take a few hundred milliseconds to return) - the first one will call it and subsequent calls within a 15s period will use the values from that call.