freshen: implement ota rollback

freshen: api for rpc

freshen: implement rpc api (without transport)

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CL: Fix mg_socketpair for lwip + UDP

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Fixes https://github.com/cesanta/mongoose-os/issues/394

CL: Fix buffer size passed to inet_ntop()

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E.g. if `ASSERT_EQ(myfunc(), 123)` fails, `myfunc()` would be invoked again to print the actual value.
This can cause confusion sometimes.
To avoid this, we cast arguments to double, which is wide enough for most cases and we provide a variant for 64 bit value types for when it's not.
We also perform a check and fail if argument to the check results in loss of precision.

CL: none

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CL: none

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Which is a replacement of (deprecated) `mg_http_parse_header`, but,
similarly to `asprintf`, allocates a new buffer if the client-provided
one is not large enough.

Also use it throughout mongoose code, and thus some header-related
limitations are removed; in particular,
https://github.com/cesanta/mongoose/issues/813 is fixed.

CL: Mongoose Web Server: Deprecate `mg_http_parse_header()` and implement `mg_http_parse_header2()` instead, which allocates a new buffer if the client-provided one is not large enough (similarly to `asprintf`).
CL: Mongoose Web Server: Fix limitations of header value lengths, e.g. when parsing authentication headers such as nonce, etc.

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CL: none

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To properly fail a test in a subroutine, return value needs to be passed up.
This snippet makes it short.

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CL: Mongoose Web Server: Add UDP client example

Resolves https://github.com/cesanta/mongoose/issues/886

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In certain files it was necessary to make tests work from public
mongoose repo, so this commit makes things consistent.

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Even though it makes no prectical difference due to the way amalgamation works

CL: none

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CL: none

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CL: Mongoose Web Server: Remove tunneling functionality which was used by nobody

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CL: Mongoose Web Server: Publish sources and tests

Resolves https://github.com/cesanta/mongoose/issues/745

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Before it resulted in an endless recursion.

Resolves https://github.com/cesanta/mongoose/issues/871

CL: Mongoose Web Server: Fail if passed a NULL handler to `mg_bind` or `mg_bind_opt`.

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CL: Mongoose Web Server: Digest authentication: Fix nonce validity check (expired nonce or nonce from the future did not cause the the check to fail)
CL: Mongoose Web Server: Digest authentication: Fix nonce request value; it worked before because nonce validity check was broken as well
CL: Mongoose Web Server: Digest authentication: Add `nonce` argument to `mg_http_create_digest_auth_header()`: clients should use the value received from the server's authentication request.

Resolves https://github.com/cesanta/mongoose/issues/809

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CL: Mongoose Web Server: Websocket: Respond to Ping with Pong
CL: Mongoose Web Server: Websocket: Properly close a connection with Close frame (in response to a client's close and when protocol failure is detected)
CL: Mongoose Web Server: Websocket: Fix support of fragmented messages
CL: Mongoose Web Server: Websocket: Add support for control frames interjected in the middle of a fragmented message

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`path_info` was dereferenced without checking for NULL, and a few lines
below, it was checked for NULL.

CL: none

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CL: none

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CL: none

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Integrates https://github.com/cesanta/mongoose/pull/884
Closes https://github.com/cesanta/mongoose/issues/883

CL: Mongoose Web Server: Don't use user_data in mqtt server

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CL: Mongoose Web Server: Fix mg_parse_multipart in case of malformed request

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CL: none

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CL: Mongoose Web Server: Fix publish-subscribe example

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CL: Mongoose Web Server: Fix socket leak when there are too many open file descriptors

Fixes https://github.com/cesanta/mongoose/issues/870

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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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