Added previous and next month image properties.
Removed the rounded corners and borders, removed the vertical borders between days and removed the inner spacing so that the calendar fills the view from edge-to-edge.
Added a highlight layer which displays a round highlight on the selected day and to indicate "today"
Changed the date formatter to use veryShortWeekdaySymbols.

Removed the image colouring method in favour of templated image rendering when the image is to be coloured. The prior implementation threw a number of warnings under certain circumstances.