pyportal titano weather station cp7 updates #1727
                
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updates for cp7 Ref: #1603
also removed fallback for very old version of displayio.TileGrid
I don't have the hardware device needed for testing.
There are references to
max_sizeandmax_glyphsas well as the OnDiskBitmap / pixel_shader within code snippets on this guide page: https://learn.adafruit.com/pyportal-titano-weather-station/code-walkthrough-openweather-graphics-py