Fixed item toolboxes re-updating on windows switch
Tiny test with <QSoundEffect>
[Experimental] Added SDL2_mixed as music player
- SDL2_Mixer opening music files instantly, quickly
- having a lot of features like fade in/out, loop-points, etc.
- Possible to play MIDI files
Exists issue with MP3 files playback (you will hear silence,
but other formats: WAV, OGG, FLAC, MID, MOD, etc. playing correctly)

When was added SDL2 and SDL2_mixer libraries, you should download them
and extract headers and libs into your Qt directory
(bin, include, lib, share)