Add filter API to select either static or interactive filter chain

I'm trying to make a filter to process video through Vapoursynth engine and here's the problem - PTS changes are not allowed for the filter in the interactive chain. Not a big deal, lets just move it to the static chain. BUT the current code for choosing one of the filter chains is:

static void ThreadChangeFilters(vout_thread_t *vout,
<...>
             e->name = name;
             e->cfg  = cfg;
             if (!strcmp(e->name, "deinterlace") ||
                 !strcmp(e->name, "postproc")) {
                 vlc_array_append(&array_static, e);
             } else {
                 vlc_array_append(&array_interactive, e);

And here's another one who faced the very same problem: https://github.com/walisser/vlc-filter-pipe