subtitle: unique supported suffixes
emit positionChanged if media stop pos is unknow

issue 289
add libchardet submodule
initial packaging
Merge pull request #292 from iyzsong/debian/sid

[wip]add deb packaging for debian/sid
copy to qt dir only for make install. some paths fix
deb: dependencies, install list
deb: symbolic link libQt5AV.so -> libQtAV.so
fix some null ptr error

analyzed by clang
qmake: mingw mkdir error
deb: add missing libQt5AV.so. issue 293
repackaging for deepin