Fix inspector for images

Image inspector has some issues:

*) When autoscale is turned on, size and scale values are not updated neither are disabled
*) Lock aspect ratio does not work
*) mm/sp size check box does not update size values not size units of measure

Fixed by:

1) Sync-ing the enum at the beginning of inspectorimage.cpp with iList items
2) Adding a few extra calls to InspectorBase::valueChanged() for commands which change two values at a time