e-paper GDE021A1 display

Thanks - looks good! Shame about the constants though - must have
taken you ages to inline them, and it's something that the minifier
would have done for you just by changing prototype.C to var C :)

Javascript IDE Atom to the rescue :-)
in the end private constants wouldn't help module users, e.g. for using display.sendCommand(...), but the documentation helps module maintainers (well i hope so)

Super minor, but it looks like bitMaskArray and pixelBitPosArray are
no longer needed now?

good catch, i already changed that locally

A pull request via Espruino's GitHub is still definitely the preferred
way

ok, but it is definitely worthwile to think about NPM, at least for maintaining a module (test, versioning, own github repo, ...)