Faster char write #446
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Faster char write #446
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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. With transparent background this speeds up line write speed by about half, with non-transparent background it's about 3 times faster.