Target field animations are there!

Hi everyone!

Quick update on the latest progress of Robot Tennis:

I didn't like how the target fields just suddenly appeared on the court out of nowhere at the start of each player turn, and again suddenly disappeared at the end of the turn. It looked a bit cheap.

Hence I added some animation for each target field to smoothly expand onto the court when the player turn starts, and smoothly shrink back into the court once the player selected one of them (or decided to hold the robot position).

It is now much more fun to click on a target field, especially with that little random animation delay for each field and when the field size "overshoots" a bit at the end.