fix: PWM metatable change: setmode returns current mode fix: setup checks arg number fix name collission PWM function, PWM constant, function renamed to newPWM
fix: PWM metatable
change: setmode returns current mode
fix: setup checks arg number
fix name collission PWM function, PWM constant, function renamed to newPWM

Tieske/rpi-gpio,Tieske/rpi-gpio,Tieske/rpi-gpio,Tieske/rpi-gpio