add PayPal donate buttons in README.md
markdown does not support form element so a donate page is required
WA_OpaquePaintEvent optimize
gl: make gl painting work with QPainter
include correct gl extension header
use OSDFilterQPainter instead of OSDFilterGL for gl
qpainter should be used by all filter context
player: no screensaver when playing on windows
seek only when demux thread is running

otherwise may crash
player: statistics dialog
add format, bit rate, pixel format, channel layout, sample format in Statistics
player: statistics view and translations
player: fix kbps calculation
check, free and set null to avr context in sws_free macro
use remix matrix for avresample

channel mapping is not available in avr until avr version 1.1.
BUG:
    avr channel mapping crash for L and R
    audio format as input will always do init
TODO:
    swr remix matrix
channel mapping only once
release remix matrix after set
Fix build for FFmpeg 0.9
define SWR_CH_MAX
add script to build against many version of ffmpeg