JEplayer MP3: Update for CP7 #1632
                
     Merged
            
            
          
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Remove max_size usage with displayio.Group
Remove max_glyphs usage with Display_Text Label
Update OnDiskBitmap usage for filename string with CP7
Ref: #1603
Learn Guide:
https://learn.adafruit.com/pygamer-mp3-player-with-circuitpython
Updates needed: maybe
CircuitPython 5 is referred to on the first page and the Install JEplayer page, but nothing else jumps out.