And mgos_conf_check_access_n()

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Achievement unlocked: CC3220 port prints a boot banner.
Then locks up.

Included in this PR is refactoring to pull out common parts to be shared with CC3200.

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Fixed bug in websocket handshake:
now adding Sec-WebSocket-Protocol header in handshake response.

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Ignore all the mess, this is just the beginning...

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Fix headers that didn't have it

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Change the API to heap-allocate the string and get rid of a bunch of fat stack buffers.

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Write unit tests for some mg_str functions.

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Also amend api_net.js to use returned length.

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With different filesystem implementations and storage drivers, like grown-ups have :)
This is not currently used to add any new functionality, we still have
only one FS and driver on ESP8266 and ESP32; CC3200 has two: SPIFFS and SLFS.
This will be used soon to implement filesystems on additional SPI flash chips and SD cards.

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 - Move keep alive management up to the Mongoose library
 - Only outgoing control messgaes should reset keepalive timer
 - Add unit test

https://forum.mongoose-os.com/discussion/1155/mqtt-keep-alive-compliance-issue

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Rationale: this is the optimisation to make JS FFI-ed API
work nicer. We don't have strucuture introspection now,
and do not generate offsets automatially. Thus, using a
stable well-known location of the parsed message body is
better, in case of number of HTTP headers macro changes.

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Remove the specialized URI parser, clean up code a bit.

Fix parsing of URIs with IPv6 hosts (http://[2001:2:3::4]:567/)

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Not relevant for other platforms

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If http.auth_{domain,file} are configured, all HTTP requests require valid digest authorization header.
This applies to files served by mg_http_serve as well as synamic endpoints such as /update and /rpc.

mongoose-os#229

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By sending close_notify

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Frees up a bit of ram on ESP

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`mg_mqtt_match_topic_expression()` and friends are public now.

So far, only `#` is supported.

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