Speed up Sprite rotation on an ESP32
Update utf8 serial decoder to handle illegal format strings
Remove need for D0_USED_FOR_xx (issue #271)
Clean up setup files
Correct various comment typos
Reference to particular drivers in examples have been removed as
multiple display drivers are now supported.
Tabs replaced by spaces in header file by file editor.
RPi TFT with write strobe SPI clock rate dropped to 20MHz (display
cannot cope with new high rate siWriteBlock() function)
Bodmer