Micro: Bit New Image Function

[RohanCheri]

Is your feature request related to a problem? Please describe.

• Within the Micro: Bit API, there is an option to add two images together which, as shown below, superimposes their pixel values. This would be a very cool addition to the lab as it could be used to create a variety of different images and even animations

Describe the solution you'd like

• The implementation of the "add pictures" function as a block in the Images section

Describe alternatives you've considered

• Allowing for the math addition block to allow for images to also be added together

Additional context

• Micro: Bit API: https://microbit-micropython.readthedocs.io/en/latest/microbit_micropython_api.html