Version v1.2.0 to optimize code and add better debug feature

Releases v1.2.0

1. Add better debug feature.
2. Optimize code and examples to reduce RAM usage
3. Add Table of Contents

Version v1.1.1 to add examples and modify Version String

Releases v1.1.1

1. Add example Change_Interval and ISR_16_Timers_Array_Complex
2. Bump up version to sync with other TimerInterrupt Libraries. Modify Version String.

Version v1.0.1 add complicated example ISR_16_Timers_Array

Releases v1.0.1

1. Add complicated example ISR_16_Timers_Array utilizing and demonstrating the full usage of 16 independent ISR Timers.

Initial Release v1.0.0 to permit up to 16 super-long-time, super-accurate ISR-based timers

Releases v1.0.0

1. Permit up to 16 super-long-time, super-accurate ISR-based timers to avoid being blocked
2. Using cpp code besides Impl.h code to use if Multiple-Definition linker error.