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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Closes cesanta/mongoose#649

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h/t @kzyapkov, cesanta/mongoose#649

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A number of people asked for a WebSocket client example,
websocket_chat_client is one.

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h/t @danielinux, cesanta/mongoose#652

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It used to link to the SJS forum category, but should point to Mongoose
category instead.

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HTTP/1.1 connections are keep-alive by default,
HTTP/1.0 are KA only if explicitly requested.

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Server header and directory index footer

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We used to declare these functions twice: in plaform_windows.h
and cs_dirent.h. Removed decl from platform_windows.h and moved
cs_dirent.h to be privately included by mongoose.c

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h/t @f00bard

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Fix WS connect address
Only update graphs when connected

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In particular, there may be additional records which should not be copied

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Closes cesanta/mongoose#649

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In SDK 1.2.0 TI decided to stop resetting NWP before sl_Start, which in
practice means that sl_start will hang on subsequent runs after the first.

See this post for details and suggested solution:

https://e2e.ti.com/support/wireless_connectivity/simplelink_wifi_cc31xx_cc32xx/f/968/p/499123/1806610#1806610

However, since they don't provide OS_debug variant of simplelink.a and
adding another project dependency will complicate our demo even more,
we just take the required bit of code.

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Socket type is unsigned int on windows.

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Mg_hello is a simpler example for CC3200
File upload form is served on / if index.html does not exist
and always available on /upload

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