Added Feather.h mappings; and
Changed RMT clock logic in RFControl to check for presence of RMT_SYS_CON_REG instead of simply looking for CONFIG_IDF_TARGET_ESP32C3;
** NOTE: Can ignore warnings about RMT_CH4...CH7+RX_LIM_REG redefine errors. This has been reported to Espressif IDF Github, been acknowledged as a bug, and will be fixed in a future release of the IDF. Since HomeSpan does NOT use the RMT peripheral for RECEIVING, these warning messages have no effect.
For developer use only - facilitates testing the same code across an ESP32, ESP32-S2, and ESP32-C3 without re-wiring by using an Adafruit FeatherBoard as a common jig.
Gregg