Causes issues on Windows - looks like "parallel" makefiles
do not handle spaces in directory names properly.

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And pre-create directories for SDK for both nRF51 and nRF52.

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Now all warnings are disabled on SDK files, and enabled on our
application's files.

Fixed a couple of things in nRF52 which were unnoticed because all
warnings were disabled there from the beginning.

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Unfortunately it turns out Nordic's examples were able to build with GCC
just because they suppressed all warnings; I had to do the same here
because there are some macro redefinitions of arm-none-eabi-gcc and
lwip.

TODO: resolve that and do not suppress warnings.

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Now it works in hardware.

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Also, do not require -DRTOS_SDK and pick socket/low-level event manager
based on LWIP_SOCKET.

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Keil actually saves project on disk only when the project is closed,
that's why these changes were missing before

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By making dir hierarchy replicate that of examples provided with the nRF
IoT SDK.

Also, example for Keil uVision IDE is added.

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 - Enable parallel build
 - Generate FW in bin format

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Update compiler version to 5.2.8

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LWIP part has been finally fully split from the ESP part, and ESP
platform defs reduced to bare minimum. It is now possible to use LWIP
in either low-level or socket mode without any ESP dependencies,
and NXP Kinetis platform is the first to make use of it.

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mbed-os is a directory that gets checked out by the mbed cli
(a tool similar in spirit to miot) and it contains a lot of
.c sources, so many of them that clang-format burns your CPU.

While we're at it, also fix check_no_ifdefs when running under a commit
hook.

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Factor out SSI and WS code from http.c

HTTP + WS are enabled by default, but MQTT is built without HTTP
support as a compilation test.

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The build has been broken because MQTT has been disabled during some refactoring
but never caught because this example was never built on CI.

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