lowres: move slice type defines into common/

headers in common/ should not include encoder/ headers
slicetype: fix unsigned/signed comparison
frameencoder: fix initialization order
pixel8: sad_x3_4 improvements
pixel8: sad_x3_8 improvements
pixel8: sad_x3_16 improvements
pixel8: sad_x4_4 improvements
pixel8: sad_x4_16 improvements
uncrustify
common: log nit
pixel8.inc: VC9 fix for SAD_4, 'pextrd' replaced with 'movd'
ipfilter : extendCURowColBorder() performance tuning