For now, we only support SPIFFS-in-a-box, same as CC3200.
On CC3200SF it should be possible to have SPIFFS on built-in flash, but that is left for later.

PUBLISHED_FROM=dee337c8cd8ed288c22abe9960eef81e6e90cc4a

PUBLISHED_FROM=5e7fcc7bf145aa8e1045e8d627b1c0731bb4341b

Also, do not accept PUBLISH and SUBSCRIBE before a sucessful CONNECT.

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Also make CC3200 use newer ARM compiler, generates slightly smaller code.

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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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https://forum.mongoose-os.com/discussion/comment/4620/#Comment_4620

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

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PUBLISHED_FROM=62c73e5fb4f70e2b5b8824ce092012508640b173

PUBLISHED_FROM=7b9c85e7708721f2c6d0e2fc8ad5c32c61b48854

Fix headers that didn't have it

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PUBLISHED_FROM=33957356e1510b73b37768496c74a6bf12630215

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

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PUBLISHED_FROM=2fc7b59b2edd0f473acd22067439471778acef8e

PUBLISHED_FROM=ed2c39b9e00a7374af7fed5af0c9acd6c330334a

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Also allow disabling conmpression and forcing server cipher list.

PUBLISHED_FROM=5539deec9c2382ba34597872dd7f3a5abc0cc311

PUBLISHED_FROM=4306e870e2cab854febb6becc198ca2247e2e002

PUBLISHED_FROM=4d4d49136e13ba8035d452a4f64fcaf48f15bdb3

PUBLISHED_FROM=f2821b104f8f2fc196ce4064b7c9f35ea152368d

Write unit tests for some mg_str functions.

PUBLISHED_FROM=1fc7e1d5d5ef259d4023f295aec8651caa3e7e86

h/t @hendrikw01

Fixes https://github.com/cesanta/mongoose/issues/826
Closes https://github.com/cesanta/mongoose/pull/831

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Also amend api_net.js to use returned length.

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Raised in previous commit by mistake

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As required by the LWIP API

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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.

PUBLISHED_FROM=293960fef82952c505e9b1925aac7724c7308362