Some minor error corrections

• Cleanup config.h and version checks
• Example for AudioKit
• Support interoperability with BLE with example
• Corrected compile error for Arduino ESP 1.0.6
• Corrected inconsistencies in the reporting of isConnected()
• define set_scan_mode_connectable_default as abstract
• bt_music_receiver_datacallback.ino remove time limit
• Support for Arduino 3.0.0: Use AudioTools for I2S
• Cleanup version checks using ESP_IDF_VERSION
• Obsolete i2s_mclk_pin_select() in ESP 5.1.1