Merge changes Iaf1ecb67,Ifdc84b17,I1480b734,I2857cd33 into udc-dev

* changes:
  chore(#MagnificationThumbnail): rename thumbNail to thumbnail
  fix(#MagnificationThumbnail): thumbnail magnifying area position is not correct sometimes
  chore(#MagnificationThumbnail): add feature flag file and fix size not correct sometimes
  chore(#Magnification): add MagnificationFeatureFlagBase