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Performance improvement: SSD1322 and SSD1331 use 'diff_to_previous' framebuffer  (#150)

* Remove redundant constants

Theses didn't really add any extra readability over comments

* Pluggable framebuffer implementations [WIP]

'diff_to_previous' will compare the previous frame and try and calculate
the differences and pass args to a device to only render those small
changes. This can be very quick for small screen updates, but suffers
from variable render times, depending on the changes applied.

'full_frame' always renders the full frame every time. This is slower
as there are more pixels to update on every render, but has a more
consistent render time.

* Use framebuffer from core

* Update SSD1322 to use framebuffer

* Update required dependency

* Fix tests

* Update changelog

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