New methods and Error Corrections

• Renamed CURRENT_ESP_IDF to ESP_IDF_4
• Added not supported compile errors for ESP32C3 and ESP32S2
• Resolved BluetoothA2DPSource connection issues to some devices (thanks to Rob Shockency)
• new AVRC methods: fast_forward() and rewind() (thanks to Clark Bremer)
• Add missing SRC for idf (thanks to Anis Jonischkeit)
• corrected some missing connection_state callbacks (thanks to Geert Roumen)
• Issue error to log when esp_avrc_tg_set_rn_evt_cap fails
• Enable easy detection of failed authentication (thanks to hogthrob)
• additional parameters for set_auto_reconnect method to better control the auto reconnect: void set_auto_reconnect(bool reconnect, bool afterNormalDisconnect=false, int count=AUTOCONNECT_TRY_NUM ).
• use different last_bda names for source and sink
• provided get_connected_source_name() method thanks to Clark Bremer
• added set_volume to bt_music_sender_write example
• new class OneChannel8BitSoundData with bt_music_sender_write_8bit example
• new method set_swap_lr_channels() to swap left and right channels
• example for status callbacks: bt_music_receiver_status_callback.ino
• Removed DEPRECATED methods: isConnected, set_on_connected2BT, set_on_dis_connected2BT