* support all weekdays as start of week, not only Sunday and Monday
(at least Saturday is used for real, too)
* introduce BWeekday as enumeration of weekdays (currently in Locale.h,
may be moved somewhere else later)
* change CalendarView to use BDate as its model, not individual values
for day, month and year, such that no more date computation is done
in CalendarView itself
* some more style cleanups in CalendarView along the way
* add monthwise paging to CalendarView
* adjusted Deskbar and Time preflet accordingly
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42720 a95241bf-73f2-0310-859d-f6bbb57e9c96
* determine first day of week and draw calendarview accordingly
* some cleanup: drop superfluous DateTimeView::Draw()
* automatic whitespace cleanup
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42697 a95241bf-73f2-0310-859d-f6bbb57e9c96
