Remove max_size parameter from displayio.Group
Closes #4959

This is potentially a breaking change as the constructor signature is changing.

Status of dependents:

Frozen modules

> grep -r max_size frozen | wc
      0       0       0

All frozen modules that use max_size have been updated

Adafruit_CircuitPython_Bundle libraries - after the next release

>> Adafruit_CircuitPython_Bundle  main
> .update-submodules.sh
> grep -r max_size * | grep -v adafruit_fram
libraries/drivers/displayio_sh1106/examples/displayio_sh1106_simpletest.py:splash = displayio.Group(max_size=10)
libraries/drivers/displayio_sh1106/README.rst:    splash = displayio.Group(max_size=10)

All code/examples/docs have been updated, merged and released except

• https://github.com/adafruit/Adafruit_CircuitPython_DisplayIO_SH1106 - PR merged, no new release yet.

CircuitPython_Org_Bundle
All code/example/docs have been updated, merged and released.

CircuitPython_Community_Bundle libraries

>> CircuitPython_Community_Bundle  master
> .update-submodules.sh
> grep -r max_size *
libraries/drivers/gc9a01/examples/gc9a01_simpletest.py:splash = displayio.Group(max_size=10)
libraries/drivers/gc9a01/README.rst:    splash = displayio.Group(max_size=10)
libraries/drivers/ili9163/examples/ili9163_simpletest.py:splash = displayio.Group(max_size=10)
libraries/drivers/ili9163/README.rst:    splash = displayio.Group(max_size=10)
libraries/helpers/circuitpython_display_frame/examples/display_frame_pygame_display_simpletest.py:main_group = displayio.Group(max_size=10)

All code/examples/docs have been updated, merged and released except

• https://github.com/tylercrumpton/CircuitPython_GC9A01 - PR merged, no new release yet.
• https://github.com/FoamyGuy/CircuitPython_Display_Frame - PR merged, no new release yet.
• https://github.com/electronut/Electronutlabs_CircuitPython_ILI9163 - PR submitted, NOT merged or released yet. This repo appears to have had no activity in over a year.

Learn Guides
adafruit/Adafruit_Learning_System_Guides#1603
Progressing slowly but steadily.

Testing
This has been tested successfully on a PyPortal Pynt with a selection of example code from libraries that previously used max_size.
Adafruit CircuitPython 7.0.0-alpha.5-dirty on 2021-07-22; Adafruit PyPortal with samd51j20