A new report from ABI Research claims that the technology behind Apple’s iBeacons is set to expand on a massive scale over the next five years, thanks to new applications that will make use of the “indoor GPS” abilities and personal notification services of Bluetooth LE-powered beacons. While Apple is the best-known “brand” of Bluetooth-enabled sensors with its iBeacon hardware and technology catching on, the study says Apple is unlikely to get into making the actual hardware that will generate $500 million a year by 2019….