[inky] Add Inky Impression 5.7" and 4" support

[caglar10ur]

Inky Impression is a 7 color ePaper/eInk HAT that comes as 5.7" (600 x 448 pixel) or 4" (640 x 400 pixel) variants.

This commit also refactors the existing 3 color Inky code a bit and adds additional auto-detection improvements.

Tested with 5.7" version.

[maruel]

Thanks! Will try to review tomorrow.

[codecov-commenter]

Codecov Report

Merging #55 (0de3494) into main (ae32059) will decrease coverage by 2.4%. The diff coverage is 0.0%.

@@           Coverage Diff           @@
##            main     #55     +/-   ##
=======================================
- Coverage   64.9%   62.5%   -2.4%     
=======================================
  Files         60      64      +4     
  Lines       7066    7337    +271     
=======================================
+ Hits        4583    4585      +2     
- Misses      2329    2598    +269     
  Partials     154     154             

Impacted Files	Coverage Δ
inky/impression.go	0.0% <0.0%> (ø)
inky/inky.go	0.0% <0.0%> (ø)
inky/opts.go	0.0% <0.0%> (ø)
inky/types.go	0.0% <0.0%> (ø)
inky/types_string.go	0.0% <0.0%> (ø)
as7262/as7262.go	99.3% <0.0%> (+0.7%)	:arrow_up:

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[caglar10ur]

Thanks for the review! Will address your comments (probably over the weekend) and ping you once it is ready for another pass.

[caglar10ur]

@maruel I believe this is now ready for another round of your review. Thanks.

Also I'm planning to squash the commits into one before merging, please let me know if that is not what you prefer.

[maruel]

I squash and rebase anyway, so you can squash if you want but it doesn't matter with what gets merged in.

[caglar10ur]

I squash and rebase anyway, so you can squash if you want but it doesn't matter with what gets merged in.

Great, will leave it as it is then. Some folks just merge without squash/rebase and I'm a not big fan of that :) Thanks

[maruel]

Please fix the err shadow. I know it's overly zealous but it's easier to enforce it wholesale than comment on the relevant cases in code review.

[maruel]

Thanks a lot!