0.4.2 release

add output enable functions (#19)

- add OutputEnable control functions.
- add example **PCA9685_OE_control.ino**
- update unit test.
- **configure()** now returns error state
- add I2C_SoftwareReset()
- moved code from .h to .cpp
- update readme.md
- update GitHub actions
- update license 2023
- minor edits