Optional specification of SSL/TLS cipher suites.

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These are not spammy and help debug issues with serving files

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URLs like mongoose-iot.com are left intact

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 - LWIP UDP sockets are always writable and they are not reported as
   such by select() (bug? featuyre?). TCP sockets are ok.
 - Always deliver MG_EV_POLL, whether we have other fd_events or not.
   Otherwise MG_EV_POLL would not be delivered at all to perma-writable
   UDP sockets (as they are on LWIP).
 - Ignore EAGAIN/EWOULDBLOCK errors while connecting, this happens
   during SSL handshake.

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Until issues with hardware I2C are resolved

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Factor out common part of SPIFFS libc interface support from the CC3200
port and reuse it for ESP32. Minor cleanups.

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This PR does not include `fw/platforms/pic32` since it's too dirty.

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Fix errors so it builds.

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Namely, define it if only `MG_ENABLE_HTTP_STREAMING_MULTIPART` and
`MG_ENABLE_FILESYSTEM` are on

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And use it for `FW_ARCHITECTURE`. This is needed because with
Microchip's xc32, `-DFOO=\"bar\"` results in `FOO` being `bar`, not
`"bar"`, so we have to stringify differently.

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On PIC32MZ, this is required to get `ntohl` and friends.

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Assume handshake request was declined if either MG_F_CLOSE_IMMEDIATELY _or_ MG_F_SEND_AND_CLOSE is set.

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Free keys and cert before conf, not after

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Renegotiation is disabled, so we don't need them.
Reduces per-connection usage when idle by 3K.

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