Mapsui.UI.Forms.Pin: add property 'RotateWithMap'
Mapsui.UI.Forms.Pin: add property 'RotateWithMap'

* implementation based on Mapsui.Styles.ImageStyle.RotateWithMap
* see issue #1001

charlenni/Mapsui,pauldendulk/Mapsui,charlenni/Mapsui