Strings: Update description and setting name for multi thread frame decoding
DVDVideoCodecFFmpeg: Disable hw acceleration when frame threading is enabled
Settings: Disable vdpau / vaapi / dxva2 / openmax if frame threading is selected
fixed: crash on exit when playing a file via upnp's "play with" (fixes #14559). We called stop on a player (upnp) which service was already stopped.
Merge pull request #4056 from wsoltys/fix_upnp_crash

fixed: crash on exit when playing a file via upnp's "play with"
Merge pull request #3950 from fritsch/warning-text

Don't use hw decoders when doing multithreaded decoding