v4.0.0

• optimize code where needed
• group parameters in each constructor into config class.
• introduce CategoryDavViewConfig, OverFlowDayViewConfig, EventDayViewConfig, InRowDayViewConfig
• update example
• fix InRowDayView issue

v3.3.0

Category Overflow DayView:

• [Breaking] CategoryDayViewEventBuilder now only provide not null event.
• Added CategoryBackgroundTimeTileBuilder - Allow user to customize the UI of each time slot in the background. (see example)