swscale: modify output aspect ratio if transformation is not homothetic

Close #10745
stream_filter: smooth: some streamindex have no fragments (fix #11377)

SteamIndex for Chapters have no stream, then no qlevels
stream_filter: smooth: fix memleaks
stream_filter: smooth: fix memleak
stream_filter: smooth: useless code cleanup
stream_filter: smooth: node & attributes names are exclusive
Qt4: prune SQL media library code

refs c2c113e3922242765c747a8db93833575e5284f8
Qt4: remove models and signals proxying

Was introduced as workaround for the SQL ML Classes design mess

refs 2f353e1801c97f7045e744ac2b0b501ed48ed34b
Qt: update preferences intf preview
demux: avformat: rotate clockwise.

No code comments: no clue. But mp4 needs clockwise.
fdkaac: set channel configuration
fdkaac: cosmetics
fdkaac: simplify profile selection
fdkaac: move variables declaration
fdkaac: reduce context size
fdkaac: coding style
fdkaac: simplify bitrate calculation
fdkaac: simplify parameters setup
fdkaac: simplify parameters checks
fdkaac error strings: compactify