And also probably prevent a crash when trying to enable WiFi there.
We really shouldn't even show the WiFi stuff on some of these old
devices, but at least now it doesn't crash ;).
Guard against trying to get any kind of frontlight info on devices
without one.
So far the flIntensity prop has always been there, even on devices
without one, but better not assume that'll always be the case ;).
That, and be consistent with the other lipc_handle tests.
This is a major overhaul of the hardware abstraction layer.
A few notes:
General platform distinction happens in
frontend/device.lua
which will delegate everything else to
frontend/device/<platform_name>/device.lua
which should extend
frontend/device/generic/device.lua
Screen handling is implemented in
frontend/device/screen.lua
which includes the *functionality* to support device specifics.
Actually setting up the device specific functionality, however,
is done in the device specific setup code in the relevant
device.lua file.
The same goes for input handling.
