Arduino_GFX Add more support for display drivers!

This fork is Arduino_ The fork of GFX-1.3.7 has been added to this fork for the following display drivers：

Screen type	Driver chip	communication protocol
AMOLED	SH8601	QSPI

Add the following functions

Function	Effects
void Display_Brightness(uint8_t brightness)	Adjusting display brightness
void SetContrast(uint8_t Contrast)	Adjusting Display Contrast(Sunlight Readability Enhancement)

Name		Name	Last commit message	Last commit date
Latest commit History 1,040 Commits
.github		.github
examples		examples
more_examples		more_examples
src		src
.gitignore		.gitignore
README.md		README.md
README2.md		README2.md
library.properties		library.properties