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

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amalgamation, ansi C and queue.h usage issue

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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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This event is sent at the end of the request

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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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 * Make kr_{send,recv} report status via return code instaed of errno
 * Move mg_if_* recv and connect callback invocation out of LWIP
   callbacks: these can be nested and we don't want that to happen
   to our callbacks. Instead, we post events for the event manager to
   process during next poll.

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(It compiles, but doesn't really work yet)

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 - Enable parallel build
 - Generate FW in bin format

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