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

fix(espnow): Fix wdt when call espnow delete

internal: e2365454

NEW VERSION: 1.5.0

1.  add spi flash erase protect mechanism, boot and current runing user
bin can not been erased;
2.  add memleak debug feature;
3.  fix spi overlap issue;
4.  fix call wifi_station_disconnect, disconnect event enter twice
issue;
5.  fix crash when set opmode from station to softAP in scan done
callback;
6.  modify spi flash erase/write flow, clear protect status if needed;
7.  fix rf init data sector broken issue, add user_rf_cal_sector_set,
user application MUST have this function, refer to examples;
8.  fix system parameter sector broken issue when frequently power
on/off;
9.  fix the max value of os_timer_arm;
10. fix dns issue in some routers;
11. add sntp support;
12. update smartconfig to 2.5.4;
13. update open freedom to support send beacon packet;
14. fix seldom rf not work issue after external reset;
15. fix pwm issue;
16. fix status error got by wifi_station_get_connect_status;
17. fix assert in pp;
18. fix huawei X4 connect softAP issue;
19. optimize sleep strategy；
20. add vendor IE support;
21. update libphy.a to 1055;
22. add weak function wifi_set_backup_mac to let user set MAC;
23. fix bug of lwip and optimize socket mechanism;
24. update boot loader to v1.6;
25. update esp_init_data_default.bin
26. add mbedtls support；
27. fix other bugs;

Version 1.4.0(cb4060d9)

1. fix a bug in wifi_send_pkt_freedom;
2. modify driver code due to _xt_isr_attach parameter changed;