fridolinux_water_remix1

Remix of original made by fridolinux (forum the https://forum.snap.berkeley.edu/t/2171 
topic). I asked for help on how to add the 'pause if' condition to animation block, which was solved by Brian Harvey in the https://forum.snap.berkeley.edu/t/9179/2 forum topic. You can freeze the droplets by moving the mouse to the bottom of stage (touching an invisible shape, which will in turn change its transparency based on the amount of droplets touching it). Except for the droplets that have been touched by the mouse; those will continue moving.