[ #30495 ] Fix video codec selection
fixuifiles
[ #30520 ] Mitigate SHM race condition with more mutex

It still crash, but less often
[ #30520 ] Be even more carefull to prevent deaklock and races
[ #30280 ] Use QGraphicsScene to initiate the GLWidget (doesn't work)
[ #30280 ] Make video work again
[ #29293 ] Make Krazy2, Coverity, GNU-CC, CppCheck and Valgrind happy