Also, move the rendering setup code to shared-module from
shared-bindings.
In CP 5.0, displayio_display_core_set_region_to_update now starts
its own transaction, so it has to be moved outside of the transaction
started by the render call.
This also improves Palette so it stores the original RGB888 colors.
Lastly, it adds I2CDisplay as a display bus to talk over I2C. Particularly
useful for the SSD1306.
Fixes#1828. Fixes#1956
This is a C module with some low-level functions required for the
CircuitPython "stage" library. It provides support for fast
rendering of tile grids and sprites on SPI-based RGB displays.