Fix headers that didn't have it

PUBLISHED_FROM=ce8140783d4b661f16278a4a5adc957b21965473

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

PUBLISHED_FROM=c793dc64a9a044a9769d92ea16859f5d704a2181

PUBLISHED_FROM=4306e870e2cab854febb6becc198ca2247e2e002

Write unit tests for some mg_str functions.

PUBLISHED_FROM=1fc7e1d5d5ef259d4023f295aec8651caa3e7e86

PUBLISHED_FROM=1803e726eee7bb64496d70389655083eb70257ab

PUBLISHED_FROM=efa9cc3aaf0c5ae8841e029370f882b615cebf1b

PUBLISHED_FROM=e69e298a51dbe0f9c47184169ecad06eef0676fc

PUBLISHED_FROM=98fb6c78d20a98dfba07ba6671bd51a394bbc4ca

Also amend api_net.js to use returned length.

PUBLISHED_FROM=38e15f9587edf28049c5b9e5f126b4db159910e8

PUBLISHED_FROM=32bda9e86a11cad3b908d211a1f7bc9d27312874

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.

PUBLISHED_FROM=293960fef82952c505e9b1925aac7724c7308362

 - 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

PUBLISHED_FROM=f86e30744ded53a6f7f96afec066b4ff3b4372c0

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.

PUBLISHED_FROM=55bf25ac77060a9c81dfecd6601f037562530801

PUBLISHED_FROM=cea0fc4db21f5b68fd3e779334989fef84a1637a

PUBLISHED_FROM=533e134a48e0fca55509c3eb16b0a6b64c1188e8

PUBLISHED_FROM=c1310b7d62f3ad6e2f24fea9f5229588c56b0bbe

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

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

PUBLISHED_FROM=968ad97585d928123106ce3828920ee073113f83

PUBLISHED_FROM=c7e3132d55e603f159019e3f0290e01b189e75e0

Not relevant for other platforms

PUBLISHED_FROM=65b8959ee677555e2fb330c84d443e0a93d9fd1c

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

PUBLISHED_FROM=824d594147cfeb2428b463d24478b207839aa5e2

PUBLISHED_FROM=66b2dee87dc50de5f2891dee789beec89c3f6fb4

PUBLISHED_FROM=257deff5ea20302627e77a0f29cf2359276a41d4

PUBLISHED_FROM=2babde0d0c6add14aa500f4bf1c833715d979c6c

PUBLISHED_FROM=56fdeaf4965ef26c398267c8656735bb52e45085

PUBLISHED_FROM=10772301ef115c31ada3521ff4235c33a421b782

PUBLISHED_FROM=51d68829414739b04fafc9198d86b817c38d71d2

By sending close_notify

PUBLISHED_FROM=028a001cb9470a16cc7a6544805bfb042a435779

PUBLISHED_FROM=29a204c2c7f35724b6f1e8435edb94869da2362c

PUBLISHED_FROM=93fe1cc2c5e2513509511a81e5919cbd37056b10

Frees up a bit of ram on ESP

PUBLISHED_FROM=0ea046cc63704481bca138b3096937669b94733d

PUBLISHED_FROM=b5b12cdf4273f21dbcdac9bfb6a06063152914c9

PUBLISHED_FROM=1bdacf793b35ebe70d0a3a9d64260dd2bd135c73

PUBLISHED_FROM=35e8f18aa611b45c271d0178d9197291bfa9726d

`mg_mqtt_match_topic_expression()` and friends are public now.

So far, only `#` is supported.

PUBLISHED_FROM=20c031bcf34be84771c4a9c456318634eb9a517c

PUBLISHED_FROM=ca5332e63700274ed9aeea9d9d1802e89fa788fa

For both OpenSSL and mbedTLS

PUBLISHED_FROM=0bfd5f128b4c4c062cb6f0ca0da9b30790aa8bf8

PUBLISHED_FROM=f0fe58c9f01ef0c7b491ed0e5f51b983e4119507

PUBLISHED_FROM=478792d0479ba2154f0a65eea066f6ae6f235f84

PUBLISHED_FROM=7864ffa26cb553f5d4a93248f67c288327ec23b0

PUBLISHED_FROM=6724de19c28f972a785b0d5e7dd4b41889e04850