wsbak

Removed jcenter/bintray Migrate to AndroidX Fix some bugs Permits to hide duration User can select an open date range Oups, renamed leavejenn to wsbak ... so can not merge ?

Using sample After screen rotation : - 👍 everything visually work - 👎 onDateRangeSet is no more called when clicking on ok

16 is displayed vertically on this screen dump :  Seen on French language (january, february, march and august) on : - Nexus 4 - Galaxy S7 Not seen on...

So dates are not visible (until you select one which becomes white on green circle) Background should be ~black