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. Add support to Adafruit `NRF52840_LED_GLASSES`
5. Optimize library code by using `reference-passing` instead of `value-passing`
6. Update all examples
7. Update `Packages_Patches`

Author: khoih-prog

README.md

@@ -143,7 +143,7 @@ The catch is **your function is now part of an ISR (Interrupt Service Routine),
 
 ## Prerequisites
 
- 1. [`Arduino IDE 1.8.19+` for Arduino](https://www.arduino.cc/en/Main/Software)
+ 1. [`Arduino IDE 1.8.19+` for Arduino](https://github.com/arduino/Arduino). [![GitHub release](https://img.shields.io/github/release/arduino/Arduino.svg)](https://github.com/arduino/Arduino/releases/latest)
  2. [`Adafruit nRF52 v1.3.0+`](https://github.com/adafruit/Adafruit_nRF52_Arduino) for nRF52 boards such as Adafruit NRF52840_FEATHER, NRF52832_FEATHER, NRF52840_FEATHER_SENSE, NRF52840_ITSYBITSY, NRF52840_CIRCUITPLAY, NRF52840_CLUE, NRF52840_METRO, NRF52840_PCA10056, PARTICLE_XENON, **NINA_B302_ublox**, etc. [![GitHub release](https://img.shields.io/github/release/adafruit/Adafruit_nRF52_Arduino.svg)](https://github.com/adafruit/Adafruit_nRF52_Arduino/releases/latest)
  3. [`Blynk library 1.0.1`](https://github.com/blynkkk/blynk-library/releases). [![Latest release](https://img.shields.io/github/release/blynkkk/blynk-library.svg)](https://github.com/blynkkk/blynk-library/releases/latest/) to use with certain example.
  4. To use with certain example, depending on which Ethernet card you're using:

library.json

@@ -1,6 +1,6 @@
 {
   "name": "NRF52_TimerInterrupt",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "keywords": "timing,device,control,timer,interrupt,hardware,isr,isr-based,hardware-timer,mission-critical,accuracy,precise,non-blocking,nrf52",
   "description": "This library enables you to use Interrupt from Hardware Timers on an nRF52-based board. It now supports 16 ISR-based timers, while consuming only 1 Hardware Timer. Timers' interval is very long (ulong millisecs). The most important feature is they're ISR-based timers. Therefore, their executions are not blocked by bad-behaving functions or tasks. This important feature is absolutely necessary for mission-critical tasks. These hardware timers, using interrupt, still work even if other functions are blocking. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software timers using millis() or micros(). That's necessary if you need to measure some data requiring better accuracy.",
   "authors":