Some yak shaving along the way

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This simplifies writing markdown docs (no need to specify relative path
to images)

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Moved filesystem-related code out of SJS and into common.
Made it possible to have one, both or no filesystems enabled.
FailFS is now SimpleLinkFS, SLFS (ahem).

Example just serves a "Hello, world!" index page for now.

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Closes cesanta/smart.js#619
Also http://forum.cesanta.com/index.php?p=/discussion/35/mixing-up-http-and-mqtt&#

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Comments in headers are changed a bit: removed adoc-specific stuff,
markdown is used instead

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This will allow to recreate the metadata after patching the FS.

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The url parser had two bugs:
- `http://example.com` -> `GET // HTTP/1.1`
- `foo://bar/baz` -> path is `"baz"` instead of `"/baz"`

Now the path returned by  `mg_http_common_url_parse` always
starts with `/`.

Closes cesanta/mongoose#631

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Timers/intervals are now implemented on top of Mongoose.
Got rid of all the platform-specific code (yay!)

Added interval support and ability to clear previously added timeouts.

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E.g. a timer-only connection

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Increase heap size to 44K (13K free after init)
Add File.list() support
Fix a bunch of bugs in file support
Disable sys_init.js, there just isn't enough RAM...

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Contributed by @f4bsch in https://github.com/cesanta/mongoose/pull/626
Submitting here with a minor change: MSDN says that ws2ipdef.h should
not be included directly and users should include ws2tcpip.h

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Identifiers starting with _ are reserved, fix those.
Wrote a tool to do it and applied it globally, why not.

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Remove Krypton TODO: SSL{,_CTX}_set_cipher_list have been added
(but these ciphers are not supported).

Fixes cesanta/dev#2975

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This should cover 2^64-2^64/2^64

H/T @julee

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