editable state by changing each element, not

previous commit change state of all column, it was not good - some
elements like images should be enabled in not editable  stage. Reason -
while you can't edit, you can copy image to clipboard or save it or show
in full screen
small code improvment
code autoformating for qml
remove some unused files

also change wotking db location, but it only my local preferences
transform delegate engine to field engine