v1.6.0 to Optimize speed with new setPWM_manual_Fast function to improve almost 50% compared to setPWM_manual and to add example PWM_SpeedTest

[khoih-prog]

Releases v1.6.0

1. Optimize speed with new setPWM_manual_Fast function to improve almost 50% compared to setPWM_manual. Check setPWM latency #19
2. Add example PWM_SpeedTest to demo the better speed of new setPWM_manual_Fast function
3. Modify examples PWM_manual to use new setPWM_manual_Fast function

---

This discussion was created from the release v1.6.0 to Optimize speed with new `setPWM_manual_Fast` function to improve almost 50% compared to `setPWM_manual` and to add example `PWM_SpeedTest`.