This is a Bluetooth Low Energy (BLE) binding that gives Tcl a
single, portable "ble" command reaching from the Mac OSX desktop to the iPhone/iPad wired into the Tcl event loop. On macOS and iOS it drives Apple's CoreBluetooth, and it is API-compatible with AndroWish's built-in "ble"
command -- so the same Tcl script talks to Bluetooth devices on macOS,
iOS *and* Android without change.
