std::invalid_argument does not work fine with translated strings as argument for message.
(the translated message is incorrectly or not displayed if it contains non ascii8 chars, at least on Windows).
KI_PARAM_ERROR can be throw-ed with a translatable/translated string (a wxString)
Code fixing Spice device names (prefixing reference with a character
corresponding to the assigned device model type) that was duplicated in
a few places has been moved to a function (NETLIST_EXPORTER_PSPICE::GetSpiceDevice()).
This commit creates more issues than resolves. It could happen that
there are components with different reference types (e.g. U1 and IC1)
that would be later converted to X1, causing a conflict.
