Revamp Displayio and Add grayscale

[makermelissa]

This change brings Displayio to being much closer in line with the current circuitpython builds, which makes it very accurate, but at this point it is not optimized for running in Python due to some removal of PIL. This adds dirty rectangle tracking as well. I have a bit more testing to do before optimization but it should support monochrome and grayscale OLEDs and allow me to close a number of outstanding issues.

Fixes #105
Fixes #95
Fixes #94
Fixes #54
Fixes #36
Fixes #32
Fixes #7
Fixes #6
Fixes #4

[makermelissa]

I just tested the SSD1327 and that's now working.

[tannewt]

Feel free to add me as reviewer when it is ready. Thanks for doing this!

[makermelissa]

I just tested the SSD1306. It's close, but still needs a little debugging done.

[makermelissa]

Closer...

[makermelissa]

If I had to guess, I'd say it's a row and column offset issue at this point.

[makermelissa]

SSD1325 tested good, which is useful since there's currently no Blinka drivers.

[makermelissa]

SH1107 isn't super close, but maybe if I can get that working, the SSD1306 will work...

[makermelissa]

Apparently it helps if you use the correct test script.

[makermelissa]

I'm going to fix the SSD1306 and I think the PR will be ready at that point. The other possibility is that it's throwing some garbage to the display prior to writing as the right side of the rectangle does wrap to the left side.

[makermelissa]

The numbers were looking correct, so I decided to compare byte for byte what was being sent to the display. Here's the place where it differs between blinka and cp:

The bytes circled in red are not being sent, but the green ones are, which happens in the core's set_region_to_update() function, which is what I suspected. I think those are the command bytes that are missing.

[makermelissa]

Much better

[makermelissa]

@FoamyGuy I added you as a reviewer since this change will likely affect https://github.com/FoamyGuy/Blinka_Displayio_PyGameDisplay since some of the "protected" functions have been renamed to match the ones used in the core.

The plan is to release this as 1.0.0 after this PR is merged, so it will be a new major version anyways.

[tannewt]

Great work on this! Didn't see anything that needs updating. Thank you so much for doing this porting.

[makermelissa]

You're welcome. I think I found one more bug that needs fixing first.