Hantek 4032L support

libsigrok now supports the Hantek 4032L logic analyzer hardware.

This is a USB-based, 32-channel logic analyzer with a samplerate of up to 400MHz (150MHz bandwidth according to vendor), with 2Gbit internal memory (DDR2 RAM, 64Msamples x 32).

It supports configuring two different voltage threshold ranges for the two sets of channels (A0-A15, B0-B15), between -6V and 6V.

It also supports an external clock mode.

Teardown photos of the device are available in the sigrok wiki, as usual.

The driver was contributed by Andreas Zschunke, with various fixes and improvements by Andrej Valek, thanks a lot!