1 refactor activity_panel to activity_panel_split and add a activity_panel(only has panel list fragment)
2 add refs.xml to values-w720p, only when device width > 720dp (for test), then app will re-direct layout file  to activity_panel_split
3 in panel activity, check splitScreen according to the current layout file
fix an error caused by having two startActivityForResult, need to check requestCode onActivityResult()
fix: back button which causes onResultActivity() error, (Back button will pass ResponseCode: Result_Canceled)
update:
Navigation/layout for cellphone basically done
Still some fix need to be done, when rotating then navigate.
fix: setting activity, start activity with FLAG_ACTIVITY_NEW_TASK, which causes result_cancelled
update: panel and device activity are now in USER_LANDSCAPE if it is split screen
update: PanelActivity , show loops now give user a toast indication if no panel is selected or panel is not in engineer mode
merge feature_multi_screen