v1.4.0 to fix `multiple-definitions` linker error

### Releases v1.4.0

1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories
2. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project.
3. Fix `reattachInterrupt()` bug. Check [bugfix: reattachInterrupt() pass wrong frequency value to setFrequency() #19](khoih-prog/ESP8266TimerInterrupt#19)
4. Optimize library code by using `reference-passing` instead of `value-passing`
5. Update all examples
6. Update `Packages_Patches`

v1.3.1 to fix warnings in PWM examples

### Releases v1.3.1

1. Fix warnings in PWM examples

v1.3.0 adds PWM

### Releases v1.3.0

1. Add PWM features and examples

Initial v1.2.1 for Portenta_H7

### Initial Releases v1.2.1

1. Initial coding to support **Portenta_H7 boards** such as Portenta_H7 Rev2 ABX00042, etc., using [**ArduinoCore-mbed mbed_portenta** core](https://github.com/arduino/ArduinoCore-mbed)
2. Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
3. Using cpp code besides Impl.h code to use if Multiple-Definition linker error.
4. Bump version to v1.2.1 to sync with [STM32_TimerInterrupt library](https://github.com/khoih-prog/STM32_TimerInterrupt)