refactor inline-diff stage hunk and stage single-line commands to be more DRY
refactor inline-diff stage hunk and stage single-line commands to be more DRY

ddevlin/GitSavvy,divmain/GitSavvy,asfaltboy/GitSavvy,dreki/GitSavvy,ralic/GitSavvy,dvcrn/GitSavvy,jmanuel1/GitSavvy,ddevlin/GitSavvy,ralic/GitSavvy,dreki/GitSavvy,stoivo/GitSavvy,stoivo/GitSavvy,asfaltboy/GitSavvy,stoivo/GitSavvy,divmain/GitSavvy,theiviaxx/GitSavvy,divmain/GitSavvy,theiviaxx/GitSavvy,ddevlin/GitSavvy,dvcrn/GitSavvy,asfaltboy/GitSavvy,ypersyntelykos/GitSavvy,jmanuel1/GitSavvy,ypersyntelykos/GitSavvy