libti*: add support for the CX II series...

[debrouxl]

TI's newest high-end calculators, which are a limited but still nice improvement over the CX I series, will be available on the marketplace soon... and libti* should therefore support them, sooner or later :)

The usual short implementation notes:

• libticonv: add new model, wire it into several functions, etc.;
• libtifiles: add the new extensions and magic strings if necessary, etc.;
• libticables: add probing for the new models, maybe new USB PID + new Windows driver and its packaging, etc.
• libticalcs: add new CalcFncts instance, etc.

[debrouxl]

Work has started on the experimental2 branch. Since this issue was created, we got to know that the CX II series uses a protocol never implemented by libticalcs before, though apparently, the NWB had been using it for a while.

[debrouxl]

Since we've got a new protocol and a new dissector, it makes zero sense to make a second implementation of a dissector in libticables, in order to integrate with the existing, horrible implementation of packet data logging + dissection at the cables level, only to refactor it later. That means that issue #12, originally queued for the next development cycle, has become a sane prerequisite for this issue, and it's probably not that hard.