Fix ASAN build for examples/cookie_auth

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The ASAN build fails with
```
cookie_auth.c:62:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
  if (cookie_header == NULL) goto clean;
      ^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:84:10: note: uninitialized use occurs here
  return ret;
         ^~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
  if (cookie_header == NULL) goto clean;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:65:3: note: variable 'ret' is declared here
  struct session *ret = NULL;
  ^
cookie_auth.c:62:7: error: variable 'ssid' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
  if (cookie_header == NULL) goto clean;
      ^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:81:7: note: uninitialized use occurs here
  if (ssid != ssid_buf) {
      ^~~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
  if (cookie_header == NULL) goto clean;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:64:3: note: variable 'ssid' is declared here
  char *ssid = ssid_buf;
  ^
2 errors generated.
```

CL: none

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Moved to https://github.com/mongoose-os/mos

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CL: none

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Was not being enabled when it should have been.

CL: Fix locking in lwip net_if

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tcpip_callback doesn't wait for the callback to run (as was previosuly assumed).

CL: mg_net_if_lwip: Fix invoking callbacks on tcpip thread

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 * ARM
   * Provide MSP and PSP
   * Provide FreeRTOS task info
   * Profide target specification XML (extra regs and FPU / no FPU Cortex cores)
 * ESP32
   * Use uxTaskGetSystemState instead of uxTaskGetTaskHandles
 * General cleanup and refactoring

CL: Core dump analysis improvements

PUBLISHED_FROM=3297ffb2e6069a3a6a598367273bc2183063cf1e

All the platforms except esp32 (which uses heavily patched 9.0 from IDF) and esp8266 (doesn't use RTOS at all) are using the same version of FreeRTOS now.

CL: Make FreeRTOS a library, upgrade to 10.2.0

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Run CPU at 180 MHz, flash at up to 100.

CL: RS14100: FS support, increase CPU and flash clock

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CL: mg: Deliver EV_CLOSE to the last endpoint handler

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CL: none

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The humble beginning...

CL: RS14100: Blinky

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CL:  Allow NULL handler for mg_bind and mg_connect

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 * Add calculated redundancy values when writing eFuse blocks 1-3
 * Perform 192 -> 256 bit key extension when encrypting images for flashing

Fixes https://github.com/cesanta/mos-tool/issues/37

CL: mos: ESP32: Add support for the 3/4 key encoding scheme

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Check response code, make sure it's 101.
Pass http_message to the client to keep it appraised.
This represents a slight change in the API -
in case of an error MG_EV_WEBSOCKET_HANDSHAKE_DONE will now be delivered where previosuly connection would just hang.
Clients that do not examine the argument may for a moment think handshake has succeeded but in fact connection will be closed immediately.

CL: mg: Fix handling of WS handshake error response

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CL: STM32F2 and Particle Electron board support

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CL: none

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Use old baud rate and autodetected divider to calculate new divider.

This works better with higher baud rates and drifting clocks.

CL: mos: Improve ESP flasher baud rate setting

PUBLISHED_FROM=7761e756c3ae7cc76e3b9a4fe3e40d06a779b2e8

cs_log_set_filter() is removed in favor of cs_log_set_file_level() which
allows setting log verbosity of individual files and/or lines.

E.g.: `mg_=1,mjs=1,=4` - level for for everything except mjs and mongoose.

We use the fact that we are usually pretty careful with our file names and use prefixes consistently.

In mos, `debug.file_level` sets the option on boot and `Sys.SetDebug` is updated to parse `file_level` option to change it at runtime.

CL: Log file:line instead of function; add cs_log_set_file_level()

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CL: mg: Properly support MQTT wildcards when matching topics

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CL: Add mg_strfree()

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CL: Send extra options with OPTIONS. Integrate https://github.com/cesanta/mongoose/pull/657

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CL: Fix nsleep100 on STM32

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CL: none

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