dont use bitmap and tilegrid background for builtin fonts#71

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FoamyGuy wants to merge 5 commits intoadafruit:masterfrom

FoamyGuy:builtin_font_background

Commits on Jul 17, 2020

dont use bitmap and tilegrid background for builtin fonts
FoamyGuy
committed

Commits on Jul 18, 2020

Commits on Jul 19, 2020

update the background as needed when changing fonts. Set the background correctly in init
FoamyGuy
committed

Commits on Jul 22, 2020

dont create a background bitmap if background_color is None
FoamyGuy
committed