Doesn't actually work yet, but bits common with CC3200 (SimpleLink) are
moved out.

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Now it can talk to backend as well to the demo device: `LCD.AddLine`,
`LED.Set`, `LED.Get`.

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And only define bits that we need afterwards.

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1) It's broken; most likely in more ways than one
2) It doesn't make much sense as long as we maintain MG_EV_POLL and
   have to traverse the list of connections anyway.
3) In Mongoose, simplicity trumps performance.

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Factor out MG task for clarity and ease of reuse.

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Explicitly loosen them on the "big" platforms.

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This allows the bazel `BUILD` file to coexist on case insensitive
filesystems such as on OSX.

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This is less than ideal, but will do for now.

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Move data collection out of main.c

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This is to make it compatioble with "devices" used in TI's libc.

Files without any "device" go to SPIFFS.

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Part of general drive to use mg_str instead of pointer + length.
Adda unit test for mg_match_prefix.

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A few tweaks to TI example
Clean up mbuf_insert code a bit

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Reduces code size a bit and makes it cleaner

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And use stdout for CC3200 demo because
  (1) an apparent bug which causes output sent to stderr to be
      printed v-e-r-y s-l-o-w-l-y (yes, it is really like that;
      https://e2e.ti.com/support/development_tools/code_composer_studio/f/81/t/501881)
  (2) in CCS it is printed in BLOOD RED, which is annoying

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Disable CGI automatically, as it's never going to work.

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Something went horribly wrong

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Part 1

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