Refactoring : Wifi only is checked at 'checking network availability' (Not fully tested yet.)

This is to integrate network check routine to one-path.
Changed all tool icons to mixture of Android original.

License dependency is reduced.
(Remaining one is App Icon.)
Refactoring : 'information' menus are moved to 'more menu'.
Support 'Move-to-top' function at AppWidget list view.

User can move to top of the list at AppWidget.