v1.2.0 to fix multiple-definitions linker error

### Releases v1.2.0

1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories
2. Improve accuracy by using `float`, instead of `uint32_t` for `dutycycle`. Check [Change Duty Cycle #1](khoih-prog/ESP8266_PWM#1 (comment))
3. DutyCycle to be optionally updated at the end current PWM period instead of immediately. Check [DutyCycle to be updated at the end current PWM period #2](khoih-prog/ESP8266_PWM#2)
4. Optimize library code by using `reference-passing` instead of `value-passing`
5. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project
6. Fix bug
7. Update examples accordingly
8. Update `Packages_Patches`

README.md

@@ -27,6 +27,7 @@
   * [VS Code & PlatformIO](#vs-code--platformio)
 * [Packages' Patches](#packages-patches)
   * [1. For Portenta_H7 boards using Arduino IDE in Linux](#1-for-portenta_h7-boards-using-arduino-ide-in-linux)
+* [HOWTO Fix `Multiple Definitions` Linker Error](#howto-fix-multiple-definitions-linker-error) 
 * [More useful Information about STM32 Timers](#more-useful-information-about-stm32-timers)
 * [Available Timers for Portenta_H7](#available-timers-for-portenta_h7)
 * [Usage](#usage)