Drawing on top of sprites

Demo of drawing on top of the sprites.  You may need to click the green flag twice to correct starting issues.

I wrote this to support the suggestion of setting the pen layer to either the front or the back.

I made a set of pen commands that mimic the motion and pen commands which can be used to draw on top of sprites.  

The usual workarounds of using clones or having a system of redrawing everything in on the screen in each frame does not always work well in a project.  So having pen commands that could draw on the front layer would be very helpful.   

My custom blocks are just front ends to the SciSnap blocks.

I used some of the tree drawing logic from this project. https://snap.berkeley.edu/project?username=manuelv24&projectname=tree

The tadpole script is a modified version of this Scratch project, Tadpole (pen) /おたまじゃくし by Ceratophrys https://scratch.mit.edu/projects/779412450/