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Must be invoked on mongoose main task, not on LWIP

Also request immediate poll oif there is data to be sent and space to
send it.

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For both OpenSSL and mbedTLS

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It's confusing

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cesanta/mongoose-os#186

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...and fix a leak where UDP connections with SEND_AND_CLOSE set would not be closed

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Close cesanta/mongoose#770

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And also fix `flash` target for nrf51

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And set to 1024 for mOS.

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Close cesanta/dev#6485

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Relate to cesanta/mongoose#780

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This reverts commit 1a17e17c462bdd4e1d26d8742f8b7087273e04c2.

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Remove examples

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Fixed a bunch of things to make OTA work on ESP32 with flash encryption:
writes to app aprtitions must be 32-byte aligned and mod 32 in size.
When merging filesystems during update, use spiffs_vfs_* functions so
that old fs is properly decrypted.

Refactored cs_dirent stuff: SPIFFS support moved to spiffs_vfs.c,
added dirent.h on ESP8266 and CC3200 which includes cs_dirent.h
Define DIR and dirent only if asked (ESP8266, CC3200, WIN32).

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cesanta/esp-idf is rebased onto espressif/esp-idf#aece3d6fc62fd91d3c5a87e0ab2ddb5ac51d8ff0

A few wifi changes and VFS support for directory-related functions.

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Now it also tries to find the included file relatively to the "parent"
file. This is required for amalgamation of the frozen into mjs, since
`frozen.c` includes `frozen.h` instead of `frozen/frozen.h`.

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