remove dependence of EventFilter because it's a internal class
realloc memory for image converter if format changed
Fix Qt5 building error

QT += widgets
QCoreApplication::argc() does not exist in Qt5
update clock using another clock
misc: building, FFmpeg spell etc
video wall: sync to external clock
remove clock.isRunning, use isActive(). fix wrong external clock value
Fix: clock not started. New: root widget.

BUG: renderers not update if have parent
demuxer: fix the wrong stream index which cause crash
License change to LGPL v2.1
remove motorola EZX support

ezx is based on Qt2, too old
drag & drop support for internal use
add aboutQtAV()
add context menu event for the event filter
videowall: fix crashes if open another file

stop player is required if use load()
translations
html format help, about. translations
fix crash when replaying a music

TODO:
why seek(0) on a music will crash
audio sync logic keep the same as video
Maemo: QImage.fill(uint) for Qt4.7.0