player: added load local preset

added load local preconfigured preset
for local movie if in folder have file with .config extension
in JSON format:

{"brightness":-0.5,"contrast":0.23,"saturation":-0.16,"gammaRGB":-0.38,"filterSharp":0.0,"hue":0.0,"success":1}
add AVPlayer.relativeTimeMode to map 1st pts to 0. correct var init
player: fix repeat and slider range. save config before qapp quit
frame extractor must seek to absolute position
Merge remote-tracking branch 'upstream/master'