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Fixes https://github.com/cesanta/mjs/issues/82
Integrates https://github.com/cesanta/mjs/pull/85

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CL: Fix OOB access in mg_match_prefix_n().
    Made mg_match_prefix_n() return non-negative result.

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CL: Fix TCP RX path regression in SSL mode

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CL: - Mongoose Web Server: close undrained and stuck http connections

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h/t @kzyapkov

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AWS MQTT connection works

Also fixes https://github.com/mongoose-os-libs/ethernet/issues/1 (because why not).

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Standardize common packages in build images, to make better use of Docker image cache.

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To avoid name clashes.

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2.0 redefined LWIP_VERSION in a way that is no longer compatible with use by preprocessor (boo).
also, tcp_pcb.acked is gone, but we only use it for debug, so it doesn't matter.

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ECDHE is way too slow on ESP8266 w/o cryptochip, this sometimes results in WiFi STA deauths.
Disable DHE completely because it's just hopelessly slow.

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Make sure topic is properly NUL-terminated.
Ignore SUBSCRIBE requests with no topic expressions.

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NULL out cgi_nc->user_data so it doesn't touch nc anymore.

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Must set SSL parameters before invoking sl_Listen

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ev_timer_time may remain the same for legit reason, so to prevent looping, instead, reset it before invoking the handler.
To let user know what the initial setting was, pass it as the argument instead of current time (which is kind of pointless).

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Now apps should use getters and setters instead of accessing struct
fields directly, e.g. instead of `get_cfg()->update.timeout` it should
be `mgos_sys_config_get_update_timeout()` to get the current value, and
`mgos_sys_config_set_update_timeout(123)` to update the value.

For now, the config structs are public, but they will be made private
soon, so use accessors to keep your code working.

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