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/sys/mcuimg.bin is just another file on SLFS, no reason to give it
special treatment. Preserve backward compatibility with old bundles:
translate sys_mcuimg.bin -> /sys/mcuimg.bin

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SimpleLink sockets are suffciently different from BSD that all the
ifdefs have become too messy to warrant a separate net_if
implementation. As part of this we also implement proper async connect
support.

Added MG_F_SSL to identify SSL-enabled connections in a generic way,
since SSL state can be different depending on the implementation.

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SL requires cert and key to be separate files in DER format.

Date verification is disabled for now.

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Make restful_server and netcat examples compilation tests:
 - netcat doesn't use HTTP, compile it with MG_DISABLE_HTTP
 - restful_server doesn't use websocket, compile it with
   MG_DISABLE_HTTP_WEBSOCKET

h/t @labourcier, cesanta/mongoose#665

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`v7_mk_undefined()` and `v7_mk_null()` are left unchanged, but marked
deprecated, and `V7_UNDEFINED` and `V7_NULL` are public now.

Xtensa code size with instrumentation: 590400 -> 590432, i.e. 32 bytes.
Xtensa code size without instrumentation: 530848 -> 531760, i.e. 912
bytes.

As objdump reveals, inside v7.c, `v7_mk_number` and others are inlined,
so the extra v7 argument is eliminated; outside of v7.c it's obviously
not inlined.

----

Also, v7_get_int() is added, which currently just casts stored double
value to int

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 * Add TI compiler
 * Remove cc3200prog, we don't use it
 * Update to Xenial (new Ubuntu stable release).
   It has ARM toolchain in the repos too, which is nice (no more PPA).

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cesanta/mongoose#573

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cesanta/mongoose#653

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We wanted to avoid `to` since it implies some kind of conversion, but
these functions merely return underlying C entity.

Public API changes:

- `v7_to_number()` -> `v7_get_double()`
- `v7_to_boolean()` -> `v7_get_bool()`
- `v7_to_cstring()` -> `v7_get_cstring()`
- `v7_get_string_data()` -> `v7_get_string()`
- `v7_to_foreign()` -> `v7_get_ptr()`

Private API changes:

- `v7_to_pointer()` -> `get_ptr()`
- `v7_to_generic_object()` -> `get_generic_object_struct()`
- `v7_to_object()` -> `get_object_struct()`
- `to_js_function()` -> `get_js_function_struct()`
- `to_cfunction()` -> `get_cfunction_ptr()`

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It would be probably good idea to also remove tools/docgen.py and
asciidoc.mk, but asciidoc.mk is still mentioned under `cloud/doc`, which
may contain some useful info which we'll need at least to review before
removing.

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Until I read the doc and find how to limit the retention,
otherwise it just eats all my ram and cpu and things start to fall
apart.

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Closes cesanta/mongoose#659

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Code size: 167144 vs 199440

More changes to come (console support, warnings cleanup).

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It's barely used in our code and conflicts with ont in SimpleLink SDK

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When getting a EOF from remote, do not close immediately, drain the send
buffer.

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