Feature: Highlight LED values for micro:bit Image blocks

[microbit-mark]

Adding highlighting for LED values would provide a visual context to the user as to what the end result will be on the device.

It could even graduate in opacity from 0-9 to signify brightness

[JoshuaLowe1002]

Really like this idea, never thought of that so thank you!

Will add this as something to look at over on https://github.com/allaboutcode/edublocks-next

[microbit-mark]

Thanks @JoshuaLowe1002. It's something @jaustin just mentioned when putting together a project in MicroPython