CL: Make esp8266 compilation a little less verbose

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Closes https://github.com/cesanta/mongoose/pull/945

CL: Fix build with CS_ENABLE_STDIO=0

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CL: Add mg_strstrip: trims whitespace at the ends of s

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Use vararg macros for this.

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h/t @YankunLi

Closes https://github.com/cesanta/mongoose/pull/939

CL: mg: Fix a bug in mg_mgr_init_opt with opts.num_ifaces

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CL: mos support for LFS (littlefs) https://github.com/ARMmbed/littlefs

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Do not clear buffer at the end of multipart request to allow following request to proceed.

Closes https://github.com/cesanta/mongoose/pull/940

CL: mg: Fix pipelining issue with multipart upload

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CL: Add missing CC3220 sub-header to mongoose.h

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curl -F file1 -F file2 ...

Add a unit test and fix a minor memory leak when returning an error.

CL: mg_file_upload_handler: Support multiple files

PUBLISHED_FROM=5c4bf2be676346fb782e80f50f79df6a6721ac88

Set CLOSE_IMMEDIATELY flag when destroying conn.
This avoid some races in LWIP adapter.

CL: mg_lwip: Fix race during clean conenction teardown

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startup cleanup on CC3220

CL: none

PUBLISHED_FROM=0998fad82fbcdbde30dca42833f2e48d148592bf

Closes https://github.com/cesanta/mos-libs/pull/2

CL: Add MG_HIDE_SERVER_INFO

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PUBLISHED_FROM=9997c64ed0c713b5b8b29df7a49b532e880eac53

CL: Fix TZ on ESP8266

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CL: none

PUBLISHED_FROM=9cb4b915906d471ef5de4e0825567d0b942d3f7b

mgos_dlsym needs to include mg_str for ffi_exports to be able to use it

PUBLISHED_FROM=a2dd167c8e8f9e9b7316a856f19a4603080c3632

Enables extra compile-time checks

CL: none

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Also remove `-O3` optimization flasg, it negates `-Os`. Saves ~400 bytes.

CL: none

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CL: Add `mg_url_encode_opt()` - a parametrized version of `mg_url_encode()`

PUBLISHED_FROM=17fa57a7a5325b51b6e3aef3855eac4e82c35782

Per standard, cookies are delimited by `; `.

CL: Fix mg_http_parse_header: treat ";" as a delimiter.

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CL: Apache license to common/

PUBLISHED_FROM=901e9e4b12a31289b3515d1f86dd56a7f0f35c5e

A major cleanup, disentangling net_if and ssl_if.
Pulled a lot of common logic into the core and reduced size of net_if implementations.

CL: Mongoose net_if and ssl_if refactoring

PUBLISHED_FROM=29bd4dcb264a1fd96b3dd164e2d880e1c2c0921e

Consume buffer as soon as we know there is no boundary there, no need to delay until next chunk arrives.
This prevents stall where buffer fills up in one go and next chunk never arrives.

CL: Fix an edge case in multipart HTTP upload parsing

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In preparation for making moving to lib.
Reduce amount of makefile copypasta a bit.

CL: none

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 * Limit total amount of headroom, in absolute terms (`MBUF_SIZE_MAX_HEADROOM`).
 * If unable to allocate with headroom, fall back to allocating the required minimum.
 * For mOS, set default `MBUF_SIZE_MULTIPLIER` to 2 to avoid floating point operations.
   Since max headroom size is now capped to 128 bytes, this will not result in much of a bloat.

PUBLISHED_FROM=11d4fc65a46a805bb7c8960f89a3d0b753c58bb8

mongoose: fix formatting

mongoose: fix formatting

mongoose: remove debugging messages

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PUBLISHED_FROM=63ce52177f5f13cb76f0fcb4689efb65a04318a2

freshen: implement ota rollback

freshen: api for rpc

freshen: implement rpc api (without transport)

PUBLISHED_FROM=9f935f676161c81464a0dc53d5d8d085b2437ffb

PUBLISHED_FROM=9a81cc34aa0039a75c851bc3685055f46936252e

CL: Fix mg_socketpair for lwip + UDP

PUBLISHED_FROM=6dd09136b3837016026523fb34acb5cc893cadbe

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

CL: Fix buffer size passed to inet_ntop()

PUBLISHED_FROM=4a6702527627ccbb780f45200274b09a28be69ee

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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