Support for PAL12L6 devices

[shift838]

Any plans to support PAL12L6 devices with the v2 board?

[hkzlab]

I'm quite busy with other projects in these days, was planning to get back to the DuPAL one day, with the intention of rewriting the analyzer from scratch.

Still, there should be support for PAL16H2 in both the analyzer and the espresso converter, which is almost identical to a 12L6 except that it is an active-high device.

You could try copying https://github.com/DuPAL-PAL-DUmper/DuPAL_Analyzer/blob/master/src/main/java/info/hkzlab/dupal/analyzer/devices/PAL12H6Specs.java to a PAL12L6Specs.java file, change what isActiveLow() returns, the PAL_TYPE string, then wire it up in the palTypes of App.java. Should be straightforward.

This needs to be done for the EspressoConverter too if it has to support the same device.

[hkzlab]

@shift838 I had some time in the evening to perform the changes. It's untested, but PAL12L6 should be an option now, you can try it.