lowres: move m_qpAqOffset from TComPic to Lowres
add methods to convert qpAqoffsets to qscale
lowres: Add states to store weighted Aq costs per frame.
Merge with default (feature freeze for 0.5)
lowres: initialize satdCost to -1
common: add --ref to the tool list so it is visible in the log
Merge with stable