Remove all references to davetcc libraries #20

Job	Run time
build (examples/abstractingPinsPCF8574/abstractingPinsPCF8574.ino)	1m 35s
build (examples/analogExample/analogExample.ino)	1m 42s
build (examples/aw9523Example/aw9523Example.ino)	51s
build (examples/buttonRotaryEncoder/buttonRotaryEncoder.ino)	38s
build (examples/dfRobotAnalogInSwitches/dfRobotAnalogInSwitches.ino)	32s
build (examples/dfRobotRotaryEncoder/dfRobotRotaryEncoder.ino)	12s
build (examples/directionOnlyEncoder/directionOnlyEncoder.ino)	2s
build (examples/exampleShiftReg/exampleShiftReg.ino)	1s
build (examples/i2cEepromExample/i2cEepromExample.ino)	1s
build (examples/interruptSwitchEncoder8574/interruptSwitchEncoder8574.ino)	1s
build (examples/ioLogging/ioLogging.ino)	1s
build (examples/joystickRotaryEncoder/joystickRotaryEncoder.ino)	1s
build (examples/matrixKeyboard/matrixKeyboard.ino)	1s
build (examples/mpr121Example/mpr121Example.ino)	1s
build (examples/multiIoExample/multiIoExample.ino)	1s
build (examples/rotaryEncoderLed23017/rotaryEncoderLed23017.ino)	1s
build (examples/timedBlink/timedBlink.ino)	1s
build (examples/touchScreen/touchScreen.ino)	1s
build (examples/avrEepromExample/avrEepromExample.ino, megaatmega2560)	57s
build (examples/arduinoEEPROMExample/arduinoEEPROMExample.ino, esp32dev, esp01_1m)	1m 18s
build (examples/esp32touchSwitches/esp32touchSwitches.ino, esp32dev)	1s
build (examples/touchScreenFT6206Lib/touchScreenFT6206Lib.ino, esp32dev, esp01_1m)	1s
	8m 0s

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