Nathanjshaffer faster char #445
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change GFXbutton private members to protected
reduced drawChar function write time by about half by collecting similar pixels in a column and writing once with faster rect function
Bugfix clang Document member variables in Adafruit_GFX_Button corrected compile arrors more clang fixed variable documentation
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Sped up char writing with built in font by grouping pixels in column of character map then using writeFillRect() for less spi overhead