Popup refactor

1. Move all style properties to widget.tss
2. Create close button dynamicaly to make widget more independence
3. Cleanup
I added try-catch to prevent Titanium show useless error dialog with something like 'Requested module not found'. Istead I show more usefull message 'Add 'ti.ux.iconbutton' to use close button' to log. I tested it on very old devices and no **real** performance regression vs creating new window. And it call only one time.