Add starting zoomScale

[Tamiyadd]

added zoomScale props to set starting zoom scale

[lecler-i]

For android

Why don't you use the aldready implemented zoomSystem using variable scaleFactor ?
You would just have to add a new props like you did that change this value and reupdate the childs whe changing it.

[Tamiyadd]

@lecler-i thanks for the suggestion, sadly i'm not an android developer so i implemented the simpliest solution that come to my mind.
I'm open to some code hint to improve the android part