v1.4.0 to fix multiple-definitions linker error, to fix bug, to optimize library code, etc.

Releases v1.4.0

1. Fix multiple-definitions linker error. Drop src_cpp and src_h directories
2. Add example multiFileProject to demo for multiple-file project.
3. Fix reattachInterrupt() bug. Check bugfix: reattachInterrupt() pass wrong frequency value to setFrequency() #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 features and examples

Releases v1.3.0

1. Add PWM features and examples

Initial Release v1.2.1 for Portenta_H7 boards, using ArduinoCore-mbed mbed_portenta core

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
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