Provide a better list for "init" device list

It's getting increasingly difficult to find the device code name in the (thankfully) huge list of devices supported.

One idea of a better view would be:

Available (105):
amazon:
    amazon-thor
asus:
    asus-duma, asus-flo, asus-grouper, asus-t00f, asus-tf101, asus-z00t
bq:
    bq-chaozu
(and so on, so splitting the code name with dashes and take the first part and display the devices like that)

Tab completion also wouldn't hurt 😉