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Based on MarlinFirmware/MarlinDev#200 from @eboston
lcd_setcontrast
toset_lcd_contrast
LCD_CONTRAST_(MIN|MAX)
defines, default 0-63set_lcd_contrast
)miniVIKI
(for completeness)HAS_LCD_CONTRAST
SAV_3DGLCD
display optionsReferences: #751 (comment), #3912 (comment)