WidgetDrawer - hide widgets

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- brand new handle - now round and freely movable!
- hope it fits on smaller screens!
----- version 0.4 --------
- NEW FEATURE: Widget Drawer hides automagically (Activity starts, Call comes in etc... )
- better positioning when adding
- fixed widget delete bug
- fixed drag&drop bugs
----- version 0.3 --------
- fixed vanishing widget bug
- fixed bug in Google Play Link
- fixed auto-unfolding bug
- fixed size of small green button for all resolutions
- fixed gridsize to multiple resolutions