This adds compile-time checks for format strings.

Fix issues exposed by this.

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Configured via `debug.std{out,err}_topic`

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This reverts commit 1a17e17c462bdd4e1d26d8742f8b7087273e04c2.

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URLs like mongoose-iot.com are left intact

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`MG_ENABLE_...` macros are not yet renamed because it involves some
logic change: e.g.  instead of defining `MG_ENABLE_MQTT`, one should
define `MIOT_ENABLE_MQTT`, which should imply `MG_ENABLE_MQTT` as well.

Macro refactoring is going to be done in another PR.

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Update compiler version to 5.2.8

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"#if FOO" still works with simple -DFOO, but gives more flexibility.
Specifically, if user expressed no preference (FOO is not defined),
we can apply reasonable defaults (this is the legitimate use of ifdef).

In short, from now on, please use

 #if MG_ENABLE_FOO

instead of

 #ifdef MG_ENABLE_FOO

Since we are all used to #ifdef, this change also adds a precommit check
to police this. Specifically, in *.h and *.c files that are Copyright Cesanta,
"ifdef" and "if defined()" are not allowed to be used with macros that contain
ENABLE or DISABLE, unless the like also contains "ifdef-ok".

Hence, if you are sure you want to use ifdef, use this:

 #ifdef MG_ENABLE_FOO /* ifdef-ok */

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On my way, fixed a couple of cases where we had `()` in the header, and
non-empty argument list in the source file.

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In CCS example projects

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/sys/mcuimg.bin is just another file on SLFS, no reason to give it
special treatment. Preserve backward compatibility with old bundles:
translate sys_mcuimg.bin -> /sys/mcuimg.bin

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SL requires cert and key to be separate files in DER format.

Date verification is disabled for now.

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 * Add TI compiler
 * Remove cc3200prog, we don't use it
 * Update to Xenial (new Ubuntu stable release).
   It has ARM toolchain in the repos too, which is nice (no more PPA).

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It's barely used in our code and conflicts with ont in SimpleLink SDK

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Fix WS connect address
Only update graphs when connected

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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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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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