Merge branch 'bugfix/fix_compile_script_global_varible_error_v3.1' in…

…to 'release/v3.1'

Fix compile script global varible error (backport v3.1)

See merge request sdk/ESP8266_RTOS_SDK!759

Merge branch 'feature/add_user_data_to_bin_header' into 'master'

feat: add user data to bin header

See merge request sdk/ESP8266_RTOS_SDK!698

Merge branch 'feature/v2_bootloader_load_v3_firmware' into 'master'

Support V2 firmware update to V3 by OTA

See merge request sdk/ESP8266_RTOS_SDK!628

Merge branch 'feature/add_phy_reg_default' into 'release/v3.0'

feat: Add phy reg default when boot

See merge request sdk/ESP8266_RTOS_SDK!690

Merge branch 'bugfix/fix_calculation_overflow_of_timer_less_than_0x35…

…A_us_error' into 'release/v2.x.x'

bugfix(hw_timer): fix calculation overflow of timer less than 0x35A us error

See merge request sdk/ESP8266_RTOS_SDK!533

Merge branch 'feature/add_configurate_console_uart_swap_io_v3.0' into…

… 'release/v3.0'

Add configuration for UART swap I/O pins

See merge request sdk/ESP8266_RTOS_SDK!464

Merge branch 'feature/speed_up_smartconfig' into 'master'

feat(smartconfig): change sync pattern match num from 2 to 1

See merge request sdk/ESP8266_RTOS_SDK!391

Merge branch 'bugfix/fix_ci_release_branch' into 'master'

bugfix(ci): fix branch conflict with idf

See merge request sdk/ESP8266_RTOS_SDK!388

Merge branch 'feature/add_ci' into 'master'

Add ci script

See merge request sdk/ESP8266_RTOS_SDK!2

feat(version): Update version to 2.0.0

internal:006aaa45