Re-do abstraction of senseHAT hardware to support online editor

[sHtev]

The existing trinket skulpt built-in shim re-writes non-internal methods in this module to avoid opening framebuffer filenames.

See: https://github.com/trinketapp/skulpt/tree/master/src/lib/sense_hat

We need to devise a more robust abstraction that limits the changes to main code in the module so that merging upstream changes is kept as clean as possible.

The Pillow library abstraction could also do with an eye cast over it.

[maddyjoe]

This is as per discussions with AstroPi and Core team to make it so that we have a simpler way of handling how the Editor is updated for use in the different contexts it appears in AKA make the intregration with Mission Zero work better/refactoring.
Expect cross-working with Geraint and Core team.