@cname currently refers to the constant name in C. However, it is not always a (constant) name, but sometimes a function invocation, so naming it as @cvalue would be more appropriate.
We add support for creating `VT_ERROR` variants via `__construct()`,
and allow casting to int via `variant_cast()` and `variant_set_type()`.
We do not, however, allow type conversion by other means, to avoid
otherwise easily introduced type confusion. VB(A) also only allows
explicit type conversion.
We also introduce `DISP_E_PARAMNOTFOUND` which might be the most
important `scode` for this purpose, since this allows to skip optional
parameters in method calls.
Closes GH-8886.
We substitute the construction magic with standard constructors, move
the ZPP checks to the beginning of the ctors, and also let the function
entries be generated from the stubs.
Máté Kocsis