add min-max control for manual scaling
Autoscale is ok, but if disabled the user cannot manage min and max value in manual mode. Lima Bpm server should give access to min-max. In Autoscale mode the min-max will be updated by Lima Bpm server to the image min-max values, in Manualscale mode the min-max values will be free for change. Lima bpm server provides a new attribute min_max to set the range.