Since VS2015, float formatting is C standard compliant by default:
https://msdn.microsoft.com/en-us/library/bb531344(v=vs.140).aspx

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This file is actually port-generic and should be moved out of stmhal/ .
Other ports already use it, and thus it should use mp_hal_ticks_ms()
right away.

Since we now have it.

These MPHAL functions are intended to replace previously used HAL_Delay(),
HAL_GetTick() to provide better naming and MPHAL separation (they are
fully equivalent otherwise).

Also, refactor extmod/modlwip to use them.

Like foo.bar or foo->bar.

With MicroPython codestyle, with pointer casts, "*" packs with primary type
without space. Few other similar changes too (git diff -b -w is null).

Based on the original patch by Galen Hazelwood:
https://github.com/micropython/micropython/pull/1517 .

This is required to write structures to files, pass to FFI functions,
etc.

Addresses issue #1529.

Also make sleep.c self-contained by moving initialization code,
instead of having part of the code in init.c, and add a header file
to accomodate this.
msec_sleep() now uses the usleep() implementation as well.

Fixes issues like #1532

They return None if no data available.