widl: Fix get_explicit_generic_handle_type and is_context_handle to detect attributes set on typedefs other than the first.

Change get_explicit_handle_var to use accessors for the type structure.

Invert the property since an array being declared as a pointer is more
surprising than an array being declared as an array.

Provide an accessor, type_array_is_decl_as_ptr.

Default behavior of lcms is to abort the process when it encounters
an error it considers fatal, such as a corrupt color profile.