ESP32 support and minor fixes

For details See CHANGELOG

• Better SI4703 support, IN_EUROPE constant reworked to setup options.
• Support of using ESP32
• Enhancements in ScanRadio example
• Documentation

full changelog**: 3.0.0...3.0.1

3.0.0 Supporting more radio chips and processors

This is a major update as some behaviors in the library have changed and includes several contributions from users.

See CHANGELOG](CHANGELOG.md)

What's Changed

• Add #include <stdarg.h> in files using va_start etc by @fjansson in #52
• Si4703 rds error detect by @mathertel in #62
• Added Si4703 RDS error detection and GPIO-write-feature by @mcgurk in #57
• Added RDA5807FP with I2S support by @fehlfarbe in #61
• Major Update (Breaking changes included) by @mathertel in #63

New Contributors

• @fjansson made their first contribution in #52
• @mcgurk made their first contribution in #57
• @fehlfarbe made their first contribution in #61

Full List of changes: 2.0.0...3.0.0

SI4721 Support

Si4721 Receive and Transmit Support.

compatibility fixes

fixing version number in library.properties

Radio Library 1.0.0

This is the first published version of the Radio library.

This library is about controlling an FM radio chips by using an Arduino board and some optional components like a LCD display, a rotary encoder, a LCD+Keyboard shield or an Ethernet Shield to build a standalone radio.

It comes with several examples for different configurations and supports the following chips:

• The RDA5807M from RDA Microelectronics.
• The TEA5767 from NXP.
• The SI4703 from Silicon Labs.
• The SI4705 from Silicon Labs.