v1.2.0 to convert to h-only library, etc

### Releases v1.2.0

1. Add support to new `ESP32-S3` (ESP32S3_DEV, ESP32_S3_BOX, UM TINYS3, UM PROS3, UM FEATHERS3, etc.)
2. Add support to new `ESP32-S2` (ESP32S2_DEV, etc.)
3. Add support to new `ESP32-C3` (ESP32C3_DEV, etc.)
4. Convert to h-only library.
5. Optimize library code by using `reference-passing` instead of `value-passing`
6. Improve accuracy by using `float`, instead of `uint32_t` for `position` in degrees
7. Add example [multiFileProject](examples/multiFileProject) to demo for multiple-file project

Author: khoih-prog

README.md

@@ -47,7 +47,6 @@
   * [2. ESP32_ISR_MultiServos on ESP32_DEV](#2-esp32_isr_multiservos-on-esp32_dev)
   * [3. MultipleRandomServos on ESP32S3_DEV](#3-MultipleRandomServos-on-ESP32S3_DEV)
   * [4. ESP32_ISR_MultiServos on ESP32S2_DEV](#4-ESP32_ISR_MultiServos-on-ESP32S2_DEV)
-  * [5. MultipleRandomServos on ESP32S3_DEV](#5-MultipleRandomServos-on-ESP32S3_DEV)
 * [Debug](#debug)
 * [Troubleshooting](#troubleshooting)
 * [Issues](#issues)